An execution chamber in Huntsville, Texas. (Jerry Cabluck/Sygma via Getty Images)

Last week, having tried and failed to kill him with the more traditional lethal injection, the state of Alabama suffocated Kenneth Smith to death for his role in a 1988 murder-for-hire. In this unprecedented method, which the state has called “nitrogen hypoxia”, the victim is forced to inhale pure nitrogen, depriving them of oxygen until they are dead. Though this technique was sold as a more humane form of execution, “nitrogen hypoxia” happens to be a bullshit, made-up term used to lend a veneer of scientific legitimacy to a barbaric style of state-sanctioned murder. Smith shook and spasmed in the 15 minutes before he died, appearing to witnesses to be in considerable pain.
Pragmatically, the case against the death penalty is impregnable. Hundreds of people on death row in the United States have been exonerated in the past 50 years alone, demonstrating the serial incompetence of our criminal justice system. There is no way to evaluate how many innocent people have been put to death, though there are dozens of cases where we now know that someone who was executed was probably innocent. You may dip back into history or stick to contemporary examples. Italian immigrants and anarchists Nicola Sacco and Bartolomeo Vanzetti were put to death in 1927 for robbery and murder despite another man having confessed to the crime, and were only officially exonerated more than half a century later. One of many more recent cases of likely wrongful execution occurred in 2004, when Cameron Todd Willingham, a Texas man accused of setting a fire that killed his three children, was administered a lethal injection, despite very shaky evidence of his guilt. The testimony of the fire marshal involved was comically unscientific and unreliable, but Texas governor Rick Perry appeared to manoeuvre behind the scenes to make sure Willingham was executed, in need of the political bump that (perversely) accompanies any use of the death penalty in Texas. Then there are those, like Anthony Apanovitch, who essentially everyone admits are innocent, but whom the legal system refuses to free from death row.
Supporters of the death penalty relentlessly harp on about cases where there is supposedly no doubt of guilt, but of course cops, prosecutors, and politicians always claim there is no doubt of guilt in any case they press. Confession is frequently seen as ironclad proof; in reality, confessions are routinely coerced or obtained under inappropriate circumstances. Richard Masterson’s supposed confession occurred while he was going through a brutal drug withdrawal, and the medical examiner who worked on his case was later fired for falsifying testimony and lying about his credentials. Masterson was put to death in 2016 all the same.

And even where there is proof, there may be bias. The history of American executions, like all parts of our justice system, is rife with racism, even beyond the extra-judicial lynchings that stain our history. Since the end of the federal moratorium in 1976, application of the death penalty has disproportionately fallen on black and Hispanic men, and that’s just at the sentencing level. There’s an entire corpus of research into how the trials that lead to the sentencing phase are unduly influenced by race. On death row, the facts are stark: 41% of inmates on it are black people, who make up less than 14% of America’s population.
Even when the outcome is not an actual death sentence, the death penalty distorts our system and its underlying pursuit of justice. The potential for execution is routinely used as a threat through which false confessions and bad convictions are obtained; not coincidentally, 59% of death penalty-eligible murder cases in the past 50 years were found to have involved a supposed admission of guilt to authorities.
In any case, those vanishingly rare cases where there is genuinely ironclad certainty that a capital crime was committed can’t outweigh the dozens and dozens of cases where a sentence of death was unjustly handed down. The utter finality of death ensures that no mistake can ever be fixed. Those who are imprisoned for crimes they did not commit can never get the lost years back, but they can at least be freed, and receive financial compensation. If one innocent man is executed, that failure poisons every other execution, no matter what the facts of the crime are. That is an evil that cannot be taken back.
However you might want to quantify human life — and, for the record, I don’t think you should do that at all — the maths just doesn’t work out for the pro-execution side. Common intuition to the contrary, executing a prisoner in the United States costs more than jailing them for life. Even in the most execution-happy states, it will usually take more than a decade for the sentence to actually be carried out, and these years will (thankfully) be filled with complex appeals and legal wrangling that are immensely expensive for the state. It’s gross to engage in a dollars-and-cents justification for killing someone anyway, but if you’re committed to doing so, you’ll find the facts are against you. Especially given that the death penalty has never been proven to serve as a deterrent to committing capital crimes — partly because criminals who commit violent felonies are almost always the kind of people who do not think about consequences.
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