@thegirlcat
Delurking to say that Watson and Radcliffe et al will understand when their future career doesn't depend on them not understanding. We're in the middle of a witch hunt right now, and most people in the arts know pretty much what happened to the careers of people in the 1950's, when they fell foul of that witch hunt.
They may believe what they're saying - people in the arts who are gender critical are often keeping their heads down; the ones who aren't are frequently older, more established, and more able to contemplate never working again (because they've gone through periods of no work and know they can cope). So all their peers who speak up are likely very TWAW and they may have simply not heard the GC view.
But even if they don't, they are facing the prospect of losing a career they've been in since childhood. For some of them, they are the second generation of their family in the arts. They don't know anything else - yes, they're financially independent, but what will they do if they're cast out of the arts fold for their heretical support of a 'witch'? If all their future projects dry up and their current friends don't dare be seen with them?
So I'm taking their current 'repudiation' with a substantial pinch of salt. Yes, it'd be great if they were heroes (like the characters they play) - but if they've made a tactical decision that nobody is going to succeed in cancelling JKR, but supporting her will ruin them, that's sadly understandable.