- random kill, no reason at all, psycopathy: 20 years in jail
- justified kill: 5 to 20 years in jail
I remember the dad that killed the Karate's instructor of his son, who was raping him during 'classes'. The dad killed the guy. For many people, it was a kill and he should be in jail. However, put yourself in his shoes, wouldn't you do the same (or near the same)?
In this case, you couldn't say: "oh, that's ok, just go home, we'll sort things out", because a crime was committed.
Maybe, and I'm being extremely naïve here, maybe, that could act as a deterrent when people are thinking on committing unjustified violence against others.
Again, I don't know nothing, I'm no lawyer.