Why Is the Death Penalty Good for Society? Deterrence and Closure

Supporters say the death penalty is good for society because it is the only punishment proportionate to the deliberate taking of innocent life, it permanently removes the most dangerous offenders, it may deter future killings, and it carries democratic and constitutional legitimacy that no court has overturned. The Fifth Amendment contemplates that the government may deprive a person of life so long as due process is followed, 27 states and the federal government currently authorize capital punishment, and a majority of Americans continue to favor it for convicted murderers.¹

The Constitution Permits It

The constitutional case starts with the text. The Fifth Amendment states that no person shall “be deprived of life, liberty, or property, without due process of law.”¹ That phrasing does not prohibit taking a life. It sets conditions for doing so. The Fourteenth Amendment mirrors the same language and applies it to the states.

Challenges typically run through the Eighth Amendment’s ban on cruel and unusual punishment, and the Supreme Court has consistently held that capital punishment does not violate it. In 1972, the Court struck down existing schemes in Furman v. Georgia because sentences were being imposed in an arbitrary, almost random fashion.² It did not declare execution inherently unconstitutional. Four years later, in Gregg v. Georgia, the Court approved redesigned statutes that required a separate sentencing hearing and the weighing of aggravating and mitigating factors.³ The 35 states that reenacted capital statutes after Furman helped convince the Court that a large share of Americans still regarded the penalty as appropriate.⁴

The Court has also drawn lines that supporters cite as evidence the system targets only the most culpable. Kennedy v. Louisiana bars execution for crimes that did not result in the victim’s death, reserving it for “the worst of crimes.”⁵ Roper v. Simmons bars execution of anyone who committed the crime before turning 18.⁶ Atkins v. Virginia bars execution of defendants with intellectual disabilities.⁷ Those categorical exclusions narrow the penalty to adult offenders of full mental capacity who committed deliberate, fatal violence.

Punishment That Matches the Crime

The retribution argument is probably the most intuitive. When someone deliberately takes a life, the only punishment that matches the crime’s irreversibility is one that is itself irreversible. A 40-year sentence for a cold-blooded murder may sound harsh in the abstract, but it still leaves the killer with something the victim will never have again: a future.

This is not vengeance. Retribution in a legal context means calibrating the punishment to the seriousness of the offense. The principle is why theft is punished less severely than assault, and assault less severely than murder. If the scale tops out at life in prison for both a serial killer and someone who killed once during a robbery, the system treats fundamentally different levels of culpability as interchangeable. The death penalty sits at the top of the sentencing ladder, reserved for acts so extreme that anything less would fail to register the gravity of the harm.

Critics often frame this as the state sinking to the level of the offender. Supporters respond that the opposite is true. Declining to impose the most severe penalty for the most severe crime signals that society does not fully value the victim’s life. Under that view, capital punishment exists not to dehumanize the offender but to affirm the dignity of the person who was killed.

Permanent Removal of Dangerous Offenders

Life without parole is often presented as an equivalent alternative, but it does not eliminate the danger a violent offender poses. It redirects it. People serving life sentences still interact with correctional staff and other inmates, and correctional officers face assault rates vastly exceeding those of the general workforce. A person who murdered outside prison walls can murder inside them.

Escapes are rare, but they happen. Administrative errors occur. Sentences get reduced on appeal or through clemency decades after the original conviction. Each possibility leaves a small but real opening for a dangerous individual to harm someone again. Execution closes that opening permanently.

The argument carries the most weight for offenders with a documented history of violence in custody. Some death-row inmates have killed fellow inmates or attacked guards while awaiting execution. In those cases, life imprisonment has already failed as a protective measure, and the incapacitation rationale becomes nearly unanswerable.

Possible Deterrent Effect

The deterrence argument rests on a simple premise: people who fear death more than imprisonment will think harder before committing a capital crime. The empirical evidence is debated, but the logic appeals to common sense.

The most widely cited pro-deterrence study, by economists Hashem Dezhbakhsh, Paul Rubin, and Joanna Shepherd, analyzed county-level data and concluded that each execution prevents roughly 18 murders on average.⁸ If that estimate is even directionally correct, the execution of one guilty person preventing multiple innocent deaths represents a net saving of human life.

Other studies reach different conclusions, and a 2012 National Research Council report found the existing deterrence literature too flawed to support firm policy conclusions either way. Surveys of law enforcement leaders have also shown skepticism about the penalty’s deterrent power compared with other crime-reduction strategies. Supporters argue the uncertainty itself cuts in favor of retention. If there is a reasonable chance capital punishment saves innocent lives, the precautionary case runs toward keeping it available.

The deterrent effect may also work in ways that resist easy measurement. Plea bargaining often hinges on the threat of the maximum penalty. Prosecutors in capital-eligible cases can leverage a potential death sentence to secure guilty pleas and cooperation, resolving cases faster and sometimes recovering information that helps solve other crimes.

Safeguards Against Executing the Innocent

The most serious objection to capital punishment is the risk of killing someone who did not commit the crime. Supporters answer that no other category of criminal case receives more procedural protection than this one, and the system built after Furman and Gregg is designed specifically to prevent arbitrary or mistaken outcomes.

Two-Phase Trials With Individualized Sentencing

Capital cases are split in two. The first proceeding determines guilt or innocence. Only after a guilty verdict does the case move to a sentencing hearing with new evidence about whether this particular defendant deserves to die.³ At sentencing, the government must prove at least one aggravating factor beyond a reasonable doubt before death becomes an option. Federal law lists the qualifying circumstances, including prior violent felony convictions, killings committed during another serious crime, and especially cruel killings or those involving vulnerable victims.⁹ The defense can present any mitigating evidence at a lower burden of proof, tilting the sentencing process toward the defendant.¹⁰

Extensive Appellate Review

Capital convictions trigger automatic appellate review in most jurisdictions, and the process is far more extensive than in non-capital cases. Defendants can pursue direct appeal, state post-conviction proceedings, and federal habeas corpus petitions. The average time between sentencing and execution was about 19 years as of the most recent federal data.¹¹

Post-Conviction DNA Testing

Federal law guarantees inmates the right to post-conviction DNA testing. Under 18 U.S.C. § 3600, any person sentenced to imprisonment or death for a federal offense can request DNA testing of specific evidence by asserting actual innocence under penalty of perjury. The testing must use scientifically sound methods, and the evidence must be capable of producing material that would raise a reasonable probability the applicant did not commit the offense.¹² Supporters cite this provision as a concrete mechanism to catch mistakes before they become irreversible.

Resolution for Victims’ Families

For families of murder victims, the criminal process can stretch across decades. The 19-year average between sentencing and execution is a real criticism, filled with appeals, motions, and hearings that force families to relive the crime.¹¹ But life without parole does not shorten the process. It only removes the endpoint. Parole-ineligible inmates can still file appeals, seek clemency, or become the subject of advocacy campaigns that keep the case in public view indefinitely.

Execution provides something life imprisonment cannot: a final answer. When the appeals are exhausted and the sentence is carried out, the legal chapter of the family’s tragedy closes. Not every family wants the death penalty, and not every family that receives it finds peace. For those who do seek it, the knowledge that the person who killed their loved one has faced the most severe consequence the law allows represents a form of justice no other sentence delivers.

Majority Public and Political Support

A majority of Americans continue to support capital punishment for convicted murderers. Gallup’s 2025 polling put support at 52%, down from a peak of 80% in 1994 but still above half, with 81% of Republicans and 32% of Democrats in favor.¹³

That continued majority matters legally. The Eighth Amendment has long been interpreted through “evolving standards of decency,” and the Supreme Court in Gregg treated widespread legislative reenactment of death-penalty statutes as evidence that the public had not rejected the practice.⁴ As long as a majority of states retain the penalty and a majority of the public favors it, the democratic-legitimacy argument stands. In early 2025, the Department of Justice rescinded the Biden-era moratorium on federal executions and authorized seeking the death penalty against dozens of defendants, signaling that the political will to maintain the practice persists at the federal level.¹⁴

1
Legal Information Institute. Fifth Amendment
2
Justia. Furman v. Georgia, 408 U.S. 238 (1972)
3
Justia. Gregg v. Georgia, 428 U.S. 153 (1976)
4
Justia. General Validity and Guiding Principles
5
Justia. Kennedy v. Louisiana, 554 U.S. 407 (2008)
6
Justia. Roper v. Simmons, 543 U.S. 551 (2005)
7
Justia. Atkins v. Virginia, 536 U.S. 304 (2002)
8
SSRN. Does Capital Punishment Have a Deterrent Effect? New Evidence from Postmoratorium Panel Data
9
Office of the Law Revision Counsel. 18 U.S.C. 3593 – Special Hearing to Determine Whether a Sentence of Death Is Justified
10
Office of the Law Revision Counsel. 18 U.S.C. 3592 – Mitigating and Aggravating Factors to Be Considered
11
Bureau of Justice Statistics. Capital Punishment, 2020 – Statistical Tables
12
Office of the Law Revision Counsel. 18 U.S.C. 3600 – DNA Testing
13
Gallup. Americans Prefer Tempered Crime-Fighting Methods
14
U.S. Department of Justice. The Justice Department Takes Actions to Strengthen the Federal Death Penalty