lol You guys talking about MJ and violence. Watch Moonwalker, he's beating people up, MJ himself gets knocked around, Katty is threatened with a needle, MJ shots someone in Smooth Criminal, the mayor kills himself in Ghosts, MJ was spotted at a UFC fight and WWE and an number of their wrestlers confirmed that MJ and his kids were wrestling fans.
Whether MJ would get into a fight himself I dont know but I heard a story that in the driveway of Hayvenhurst, MJ wanted to punch Jermaine because of his song 'Word To The Badd'.
I dont Katherine would have instigated a fight because of her religion and she seems to be a rather level headed person. She may have confronted Gina verbally but not physically. As for Janet and Randy, I could deffo see Janet and Randy possibly getting heated and doing something crazy.