When I think of evil, I immediately think systems: the systematic, ritualized, reflexive perpetuance of an act that is certain to bring about something very, very terrible. To me, evil is +Ti taken to extremes and fueled by the very worst of +Fe: widespread fear, panic, hate that seemingly hovers about in a nation, or group's, consciousness, driving it toward unspeakable acts of depravity. I only need to remember the Nazis, or the state of international relations prior to WWI, to understand how dangerous such blind, mechanical, and inhumane rigor can be. From my PoV, there is too much of it already, and not enough positive self-reflection, not enough meaningful analysis. I see ENFps like Mikemex beginning to propound some ill-thought "principle" that threatens to spread like a virus, bringing with it the concealed hate it is intended to mislead to, and something in me snaps. Evil, evil, evil spreading everywhere. Callousness, mercilessness, blind rigor, like a hungry animal ripping into the flesh of the slain. Systemic, automatic, beastial, base. And when I see someone who for a moment seems to walk the path toward this end, by means of any sense of ethnic hatred, of any sense of detatchment from hard logic, my estimation of them dips to near nothing: they are trafficking stupidity, and the false rationality that follows it. Where +Fe goes, +Ti will soon follow -- blind, self-justifying rigor..., and only evil will come of it.
I'd like to make clear that I'm not saying this with regard to all +Ti, only that +Ti that is built upon hate, fear, ... the very worst +Fe has to offer. Likewise, I don't see +Fe as completely evil, either; like all functions, it has a social aspect and a raw, driven id aspect. When I see the above in +Ti, I'm really seeing the very worst in myself -- in my id -- and projecting it onto the world around me. (although, projections can be accurate, obviously.)
How does your id manifest? What inhuman horrors would you use to describe it?