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If everyone that is on death row were to suddenly be resentenced to life without parole, and integrated into the mainstream prison population, there would more than likely be a number of inmates and C.O.s murdered.
Your idea makes no sense whatsoever, unless your only concern is for the inmates on death row, most of whom are pathologically violent, extremely dangerous individuals who will undoubtedly put the lives of a great many other inmates--most of whom were not convicted of first degree murder and do not deserve to be killed by someone who has--
in very serious danger.
Ahhhh... For all the same reasons that an an innocent defendant might be wrongfully convicted?
Believe it or not, the guilty are often exonerated or allowed to plea bargain to a much lesser charge. And just so you know, the guilty go free a lot more often than the innocent are convicted.
Ever heard of O.J. Simpson?
How about Arthur Bomar?
Man Paroled from a life sentence kills college student
Because the CJS makes mistakes on both sides the scales of guilt and innocence.