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True but it’s much cheaper for us to keep them in prison than to carry out the death penalty.
I don't think it's wrong or barbaric to painlessly euthanize someone who brutally killed, defiled and ate people's bodies (among other horrible examples).
I don't think there's any argument for the rehabilitation of a person like that. You can't let them out, keeping them around is pointless, and on the off-chance they do escape, is their life worth more than the people they endanger?