He can't leave town soon enough. Hope nothing impedes his exit.
Happy? About what? His murdering of numerous people and enjoying it? Using your
philosophy, it sounds as if you would be happy to forgive him and let him go
free. Justice is equal punishment for equal crimes.
So what does it say about you that you seem to be happy about it?
Since this guy is a socio-path, having no feelings for others, he should not
mind it a bit when the needle is inserted into his arm. His lack of empathy
should be extended to himself.