Life is not black and white. You can deal in absolutes all you want, that just leaves the rest of us here to make the hard decisions, since your abdication.

Jailing people for life is also inhumane, solitary is torture that can lead to permanent damage. But what alternatives are left with? Society didn’t ask these people to steal, attack, rape or murder. Some people just choose it. So we have to separate them from the rest of us, for the common good.

Fwiw, I don’t favor capital punishment unless guilt is obvious for all to see - beyond a doubt. But if we have to do it, and situationally It’s appropriate (some will say it never is), we should do it as humanely as possible. Not that they necessarily deserve that, but ultimately it’s a reflection of us.

This is all first world problems btw. If the facade falls, we’ll all see people put down with absolute disregard. We have survivors alive today from past atrocity, we aren’t even removed in the slightest. Look up the Khmer Rouge and the killing fields, I had a coworker who escaped after watching his brother chopped apart and his mother gunned down.

Purity in your moralism is a luxury most can’t afford, unfortunately.