There was a case up here in Canada 10 years ago where a young guy beheaded another passenger on a greyhound ended up the same, whereupon he was diagnosed with schizophrenia and served some time, then house arrest.

I think total time was about 3 years and and a bunch of home confinement, and now he lives on his own.  From what I've read he lives in a regret and understands the shit he did and is medicated for it.

Initially I was shocked hes out on the streets...but the difference here is that a psychopath will probably not know any remorse, and planned it out and likes to keep doing the stuff? ...whereas the schizophrenic individual probably hates the hell out of themself upon realization of the acts committed and is aware of how fucked up they are.  I think that's why the sentences seem so light in comparison to a serial killer for example.

I don't necessarily agree with these sentences... but theres a reason for them, and it must include a widening understanding of brain issues.