I think the thing to realize in cases like Hitler, Trump and Bundy is that we, our society, helped them be very far on that end of the scale. There are several books written about all of them that show the right particular set of psychological, sociological and environmental circumstances shaped hem into what they became. Those alignments don’t happen on a regular basis so thank goodness we won’t see people like that often...but because their actions were so heinous, they are examples everyone knows.