It appears both you and Migeru are thinking of the distinction between voluntary manslaughter and murder. However, I was more thinking of the distinction between excusable homicide and murder: a religious person may perceive something as an insult to her religion even if it wasn't meant to be insulting her religion (Rushdie's case or, I believe, Pussy Riot's case) or even an insult at all (almost anything attacked as attack on Christmas).

_{*Lunatic*, n.
One whose delusions are out of fashion.}