Furthermore, consider the view of repentance. Let's say that you are at least willing to admit the possibility there is an afterlife with judgement. Having a defined date when you will die means you are more likely to repent than when you die of old age 60 years from now at some undefined time.

Also, have you investigated how much it costs the US Taxpayer to house a prisoner in a Supermax prison? If it was income, that prisoner would be making money in the upper 5%. It's also perverse to make the taxpayer pay so much to house a prisoner, who committed atrocious crimes normally worthy of death, for so long.