And why not? These days, the perpetrator is never guilty of his or her acts. It's always something or someone else.
Ever read "people of the lie"? Some folks are just plain evil. Some are just crazed because they want to be that way, or don't care to stand up for their sanity.
Classic nature vs. nurture discussion could be inserted here... but the fact is, hitler was evil because of the simple fact, that HE WAS EVIL.
Same with our al queda problem.
Well, hmm. Both Hitler and Al Queda in their own eyes were/are heroes and had the best intentions. The way to Hell is paved with good intentions. And Pharisees not only had good intentions, they were actually righteous people as well.