The relevant question is how many people exist who would have likewise killed 20 people, but didn't because the prospect of rotting in a "punishment" focused pr

The relevant question is how many people exist who would have likewise killed 20 people, but didn't because the prospect of rotting in a "punishment" focused prison scared them straight. I'm not saying that such people don't exist, I just think they're a whole lot rarer than the alternative, i.e. those who can be meaningfully rehabilitated and induced to not reoffend.