An indicator of a capable society would be permanently excluding the people who do such horrid things that it’s considered a niche. Another indicator would be not allowing such truly revolting people the ability to circumvent the minimum 20 years for premeditated murder plus whatever fucking cannibalism adds onto it by pleading insanity and having a board of professionals give a thumbs up.
He robbed someone of their life. Of their future. Not by accident or negligence but intentionally and planned. But hey, I hope someone defends the guy that scoops your brain out of your skull, eats it like a steak dinner, then goes free in a couple years because hey, he’s all better now :) Utterly absurd.