Being a womanizer is bad, right?
In MLK's case the bigger concern is laughing about a woman being raped in the same room where you are. Historically, most highly successful politicians got to the positions they achieved in large part because of their charisma and confidence. That's pretty effective with the ladies oftentimes (JFK, Reagan between his marriages, Clinton, etc.). Of course, maybe anti-charisma explains Ted Cruz.
My great-grandparents were born in the 1890s in Green Bay and knew Curly Lambeau in passing (and knew of his reputation quite well). I asked my great-grandmother about him once and she told me in a very stern voice that "he was a very, very bad man who treated a lot of girls badly and drank way too much" and that "no one should ever think of him as a hero."