......."But if you wish to protest and oppose him, that's your right, it's a noble thought and if it's worthwhile to you, then by all means go for it with my blessing. "
The problem with this is that all it does is call attention to the movie and thereby people will want to see what all the fuss is about. The old adage of things that are forbidden are always more intriguing would probably fit here. I tend to agree with your first sentence about Moore appreciating and thriving on opposition.