That argument is absurd.
The government has no more right to imprison people than people have to imprison people.
The government has no more right to give traffic tickets to people than people have to give traffic tickets to people.
Just silly. The government has the right and the duty to protect society; that’s one of its main functions. When a person demonstrates that they cannot live in civilized society (by committing murder and, in my opinion, other heinous crimes), society has not only the right but the duty to remove that person.
The problem I have with life imprisonment is that the person is not totally removed from society. They still have contact with the outside world, can still bog down our legal system with appeals, can still – as some posters have trumpeted – write books that get published.
If we had a “death penalty equivalent” prison, I could probably be convinced to give up support for the death penalty itself. This prison would be one where once you go in you have absolutely NO contact with the outside world whatsoever, period. No visits from family, friends or lawyers, no letters in or out, no phone calls, no email, no Internet access, no TV, no radio, no newspapers. No right to file ANY kind of motion or appeal to the court system. No ability to have ANY contact with ANY part of society. Removed, utterly and completely; as good as dead, to those of us on the outside. Heavily guarded, of course, to minimize the chance of escape.
Nothing would prevent anyone on the outside who cared from working on such a person’s case, digging for new evidence, etc. But until the courts were presented with compelling evidence supporting the person’s innocence, they would remain completely cut off from any contact.
But that kind of prison will never be built. There are enough factions that would consider that kind of total isolation to be cruel and unusual, or contrary to basic human rights (why a convicted murderer should be granted any basic human rights, I’ll never know) that such a prison would never be allowed.
And so I support the death penalty, because it is the only way we have to completely remove those who seriously harm civilized society.