ENTJ's are exceptionally charismatic and natural-born leaders. Combine that with generally being fairly cold and ruthless (something that is more common in Analyst types than I would care to admit), and you have a lot of possibility for their gifts to be misused. Not to mention that a fair number of sociopaths are ENTJs.
Of course, many ENTJs take the opposite side of the spectrum and become brilliant and highly beneficial leaders.
I only know a couple of people that I believe to be ENTJ; one is indeed a bully that delights in small, petty "torments" against me and other "nerds" (while completely failing to recognize that we're far too strong to be hurt by his remarks (don't ask me how he hasn't picked up on this

)). The other is a person that I have been longtime friends with and has a strong respect for just about everyone around him (except for overly authoritarian teachers, a trait which he and I share).
What I'm trying to say is, don't judge an entire personality type off of a few of the bad apples. If you judged all ENFPs by Adolf Hitler (who was, surprisingly, not a sociopath

, but was certainly mentally unhealthy in the extreme), then you'd totally miss out on a good number of mentally healthy and highly moral ENFPs.
Bknight