I don't have any insight other than what I experienced at the hands of my husband. He is a survivor. While never PHYSICALLY abusive to me, the methodic nature of what he orchestrated against me was quite sadistic. And most of it fueled by anger - heck, all of it fueled by anger. Anger at women, anger at betrayal, anger at his own feelings of no control. Seems a logical connection.... sadism is, after all, suped up control.