Psychology doesn't like to talk about evil. It likes to talk about bad childhoods. But I very much believe that some people are evil and motivation is not necessary for evil.
It's a complex relationship when your dad happened to be president and you are president and then you have all the amateur psychology that goes on when people try to speculate about motivations.
Psychological motivation is the desire to change relations between two points, and so psychology is the study of equations with two unbound variables. ("America: Three Audiences")
Sie müssen eine Vision haben und sie durchsetzen - mit Motivation und Überredungskunst.
Motivation is a fire from within. If someone else tries to light that fire under you, chances are it will burn very briefly.
Idleness is the parent of psychology.