One of my friends dad's was abusive to him, his brothers, and his mom/wife - physical and verbal/mental. I even witnessed it once. I was maybe 19 at the time...1990s.
She decided to "separate" from him...in JW terms :) . So I helped them move out of their house when he was away on a business trip. He came back in the middle of the move-out, and started getting all agitated and upset and looked like he was going to do something to his kids again. So I jacked that mother F*** in his back HARD. I was pretty swole at the term, so I know I hurt em. He didn't even try to fight me....
I was counseled and removed as an MS for that. Would still do it again. Wife wound up divorcing that sorry POS.