I don't know about the Royal thread category specifically, but the PP is correct. There have been threads where people defend Andrew, say the picture with him and Giuffre are faked, or it doesn't mean he slept with her, or she wasn't underage by British standards, PA was naive etc etc etc.
I have to agree that compared with M&H Andrew does not receive the same amount of comment. I appreciate however, that on a whole most people think him despicable so probably don't consider him worth commenting about in the first place.