While I am sure Joni has some personal connection to ML she also has tremendous powers of empathy. I see ML as one of her best acting roles, especially in live performance. Remember she is playing the role of a young woman incarcerated into dreamless drudgery merely for the way men looked at her. Her friend Peg died and was stuffed in a hole. Plenty of fodder for venom in my view. And a much more effective critique than tearing up the Pope's picture.
peace, david