Usuns and themmuns.Honestly, I think that's what this may truly come down to.
Christianity and racism seems to be a common thread for all of this shit.
Look at taxslave. Whenever something happens he don't like, he mutters darkly that somebody got paid off.
Not much of a step from that to "therefore, anything I don't like is corrupt and criminal. Therefore the whole system is corrupt. Therefore somebody is corrupting it." And who better to blame than "outsiders?" Especially outsiders that are close at hand and easy to murder?