Hilter's rise to power was through an election but prior to that there was lots of violence etc caused by the Nazi's so it shouldn't have been any surprise that he was a violent individual.

Mussolini led a coup d'etat to take a power.

And Soviet hardly had a peaceful start and Stalin played a part in that.

None of these exactly popped out of nowhere from within the government.

Last I checked none of the current 'western' governments rose to power via fear and intimidation.

That said, yes power attracts people who want power. I can't dispute that.