They are not insane, not in any medical sense anyway. You can call it "insane" but point is, given the "right" circumstances a large percentage of population can become "insane". If you piss one off enough one will eventually snap.
Well then, what is your definition of "insane in a medical sense"? It appears to be vastly different than mine. And yes, if you piss off enough people, one will eventually snap because the more people you piss off, the greater the chances that you'll piss off a crazy person.
If one hundred people get rear ended by another car and the first ninety-nine bitch and yell at the guy who hit him and the last guy shoots him in the face, there's something
wrong with that last guy.