De Niro has completely turned me off from watching anything he appears in with his inability to keep his mouth shut about politics. It is irrelevant whether I agree or disagree with the position taken by singers, actors, or anybody else in high visibility positions. I trade my money to watch or listen to your particular talent. Don't ruin that.
I don't care any more about your opinions on anything else than I do about what the guy a block down the street thinks.
I often enjoy it when artists talk politics. No reason why they shouldn't. I even like it when I disagree with them. A robust discourse is a vital part of life. De Niro as an actor I lost interest in many years ago - probably when he started doing bad comedies for the money. Scorsese I haven't found interesting as a director for a couple of decades. I'm fascinated that a Scorsese film can still arouse public passion.