I think on reflection that both sides of it come from a valid place - one, being evil can make you paranoid; two, being scared of things beyond reason can lead you to do Stupid, Stupid Shit that comes back to bite you later.

Like so many other things, it's the hugely-weighted-to-the-one-side that's at issue, in that there are reasons to be paranoid or scared that are totally valid, and there are ways of living with paranoia that do not lead to one being a mass murderer.