Are you sure? Maybe they are child abusers, or spousal abusers or tax frauds or so many other possible bad things. Can you really be sure that your approved author/actor/athlete/celeb isn’t a bad person? Do you really know any of them to be positive? Or is it ok to like them so long as you don’t know that they are bad people but it only becomes wrong if they are publicly outed as bad? I don’t and won’t do anything to financially support JKR now but I’m not going to burn any of my books by her.