Sorry fort the short reply. Long answer is that every murderer had a reason for killing. Voices in the head out covering up adultery,  it's all outside of my definition of dame. 

When someone straps a bomb to themselves because it's what Muhammad would do, they have been leg on that path but they ate insane. 

The congressional softball shooter was invited to his attempted murder by the #resist movement. Still, to take it offline required that he be insane,  in my opinion. I had a friend who was murdered and her murderer seemed have reasons that seemed to make sense to them at the time. 

Crazy is as crazy does.