People like you guys will defend people who try to murder others because you want to feign pseudo-intellectualism. You guys are what is wrong with the first world right now.
What stops literally any person from claiming 'mental health' and not paying for their crimes?
Guy rapes and murders your mother? Oh wait a minute the guy had mental health issues, sorry he couldn't help it.
Guy opens fire in the middle of a crowd? Yup, mental health problems, can't send the guy to jail for that.
Guy beheads your entire family and forces you to eat their entrails? Sounds like a mental health issue to me, no sane person would do that! Let him out, he managed to convince some people that he wasn't a lunatic (after clearly being one) to get his freedom (arguably the most important thing in life).