It is absurd, but really, it’s never been a deterrent anyway, so the length of time between conviction and execution is just a question of expense. And the fundamental problem is that the stupendous cost of sentencing a person to death and then following the long, long road to carrying out the sentence cannot be decreased justly.
Are there people who deserve death? Yes. Are there some criminals who are so broken, so irredeemable that they are beyond rehabilitation, even if our prison system were not so backwards and self-defeating, so that we’d all be better off if they were just dead? Totes. But even with all our expense and drawn-out process of today, we still occasionally execute innocent people. It’s not worth it. Vengeance as punishment doesn’t help society anyway; is it really worth giving a person their just deserts if it does no good for the rest of us?
As much as the occasional person may deserve it, the death penalty should be done away with.
And I think the suggestion that life-sentence prisoners be allowed to choose death is interesting. Interesting, but probably a bad idea for all the reasons Great Antibob mentioned, plus the remote possibility of abuse. Best leave it well enough alone.