A new technology comes around that allows us to erase people from existence, in the sense that they never existed in the first place. Every time this device is used, there’s no direct evidence of it actually working, because when you erase something from having existed, suddenly you now live in a new world where you had no idea of the thing or person you erased in the first place.
But rest assured the science is sound and to a fictitious outside-of-time observer, the device works as described.
So society decides to put it to use on those who commit the most seriously heinous crimes. Instead of the death penalty, now we sentence people to Non-existence. It is the most severe punishment the state can levy and is only used in violent and destructive crimes.
The benefits are that any victims are immediately restored as if the crime never happened in the first place, there is no chance of recidivism, and there is no ongoing prison cost. Also, the state isn’t depriving anyone of their life by killing them, they are simply denying their existing in the first place.
Since no one actually can recognize the device working by direct means, there isn’t much of a deterrent effect. Also, when the device is used, no one can ever know the potential positive effects a criminal’s existence may have had on the world. And furthermore we don’t learn from the serious mistakes of others because they just wouldn’t happen anymore.
However, after being used for several decades, violent crime rates drop off to 0, except in the cases where the criminal can’t be caught. Every time the device is used, it appears to be the first time, but with measurable statistics showing that ever since it was invented, violent crimes are way down to almost nothing, people know it is working. Even when people kill themselves during a crime, if they are posthumously convicted of a serious crime, they can be erased from history.
Some people wonder “well what happens instead of the person existing? Do his parents simply never have a child in the first place? Is a different child born?” The science is a bit fuzzy on this point but essentially nothing else changes in the universe except for the direct impact the target had due to his existence. So maybe a different person is brought into existence or maybe not. Unfortunately we don’t quite know.
So the debate is this: is this an ethical punishment? Is it better than the death penalty? Would you support it, if you lived in this world where violent crime had dropped off since it started being used?