This is about how I feel. Except, I don't think society owes him anything, considering the nature of the crimes he commited.
Williams was a murderous piece if shit thug back in the day, but he has no doubt done some good since.
For that, society can and should give him the opportunity to continue his positive work and live out his life behind bars.
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In this special case I disagree in one aspect. Society does owe him. If you study closely what the man has done, he probably prevented an uncountable number of murders. I see this completely separated from his earlier crimes. The guy was a gang member and a notorious gang leader in his youth. To my eyes, he's completely reformed and society should honour this. But this being American (and especially Californian) society, it probably won't (no matter how many people are fighting the death penalty).
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I still have to disagree on that point.
If anything he owes society for the four lives he took.
So maybe we can consider the murders he may have prevented as a partial payment for that. In my opinion he still owes and I would like to see him be able to live and continue his work.