dehumanizing another group because they are different, and depicted everywhere as the enemy and source of all of their problems is probably a good start
living in conditions where someone setting off a bomb isn't that uncommon probably doesn't help either.
of course, it's not like our own haven't been caught doing some similar things over there
And the common bond of these individuals was?
Beware the man who would rule you for your own good. He will never cease. He will regulate every aspect of your life, destroy your liberty and enslave you, and sleep well convinced that he has made the world a better place.