Actually there is nothing to stop wealthy men from doing exactly as they please. Arresting Polanski would do nothing to change that. Wealthy connected men did it before him and even after Polanski's name was spread across the world as a child rapist. It's the way of the world, and it's wrong, but what you want, will not change that.
While I hate that the full weight of the law didn't flatten him, if the victim is ok, I'm ok.