Like JKR not being pro-trans is just her opinion. And as far as I know, she hasn’t gone on a crusade against anyone yet.
using a large public platform to disseminate the same kinds of anti-trans arguments currently being used by bigots to draft legislation putting trans people at risk is not just an opinion. like, it isn’t a crusade, but when there is a crusade going on and you’re saying the same thing the crusaders are saying, its not a good look.