Rowling was on shaky ground with many conservatives already, what with Harry Potter basically being occult themes all prettied up and wrapped in a cute bow. It wa an uneasy truce due to the popularity of the series. Go and make it political on top of that, and see just how well she does in the future.
You gotta hand it to her though. She was on welfare, a struggling single Mom, suddenly comes up with the Potter series and is now a billionaire.