"The abusive man gains power through his coercive and intimidating behaviors—a sensation that can create a potent, thrilling rush. The wielder of power feels important and effective and finds a momentary relief from life’s normal distresses..."
"...It isn’t the woman’s pain that appeals to him; most abusers are not sadists. In fact, he has to go to some lengths to shield himself from his own natural tendency to empathize with her..."
This passage comes to mind every time I see people in positions of power (especially men) doling out cruelty.
Some of them are probably psychopaths. Some of them, are perhaps, addicted to the rush of exerting control over anyone they can.