I enjoyed it.
I find it fascinating what a person is capable of if brought up incorrectly, which is what appears to have happened here.
I think this is clearly a failure of 'the system'. This man was involuntarliy held in a mental hospital and then released back into society when he was obviously not ready.
I know this man did some horrendous things but I can't help but feel sorry for him. He needed help and didn't get it. The 'cat on the doorstep' incident with his mother, seems like a cry for help to me, but instead of getting help, his mother just shut the door and ignored him.
Did he deserve the death penalty? ... No, nobody does. He should have got what he so clearly needed, a lot of pscyhiactric help.
If you want to blame someone, then blame the parents for his upbringing or blame the system that failed him, but don't blame him. He did what he did because his brain was not functioning as it should and when he needed help he didn't get it.