If McV is evil, or the 911 hijackers are evil, then we have to say that the Christian cruisades were evil or that the soldiers mislead into war are evil.
I think that if you're following a crusade, or following orders, and
never taking a moment to reflect on whether your orders are right or your crusade is just; if there's never that moment of "tentativity" and introspection, then yes, I think you're engaged in evil.
If evil exists it's the tendency of humans to check their moral sense at the door just because they perceive authority, like in the Milgram experiments.
On the other hand, when someone KNOWINGLY alters the facts for their own profit, or preaches to his television audience as a way of financing his blood diamond business, that's evil.
I don't think those are the same thing. Pat Robertson, it's clear, believes his own bullshit. He has no problem with running a diamond mine off the proceeds of his charities because he genuinely believes that it is good for him to do so, and he never stops to wonder if perhaps it isn't.
When people say things like "unswerving faith and devotion", I hear "evil."
It's the person who thinks they are doing good that you can't pursuade.
And that's why I believe that's what constitutes "evil." The selfish can be managed. The crazy can be treated. The evil can only be contained. (I guess I construe evil in this way because of how that relates to justifications for the use of force. The selfish give you options besides the use of force. The evil leave you no choice.)