I'm not saying this excuses any of his behavior, but Miller himself is likely the victim of grooming. He's been around in Hollywood since he was a young teenager, and has always reportedly been very popular with certain circles of producers. The kinds of people who are protected in the same way that Brian Singer manages to not only stay out of jail, but keeps getting work.

I can only presume that Miller is being protected and continues to be employed because there are some very powerful people in Hollywood who are concerned about what he might say if his protection is withdrawn.