It struck me at the time of the Radcliffe / Watson/ Grint crap that they might be the stars of Harry Potter, but there were huge amounts of the great and good who connected to the films not throwing JKR under the bus although I know Robbie Coltrane came out and defended her.
So when all the TRAs and blue-haired avatars were claiming that the fans actually owned Harry Potter, or that Daniel Radcliffe actually wrote it, and that any right minded person hated JKR, they didn't have a huge amount of support from within the franchise, despite what has been widely reported in the press.
I'm sure I've missed some, but I don't think the anti- JKR sentiments have been echoed by Maggie Smith, Michael Gambon, HBC, David Thewlis, Bill Nighly, Jason Isaacs, Zoe Wannamaker, Chris Columbus, Imelda Staunton etc etc.
And I hate to say it, but I think that if someone is not saying anything, they are probably on the GC side.
In any case, it does not really matter. I'm sure some are very thoughtful and have big brains. But loads of actors are thick as mince, and I don't really care what they think.
As for Ralph Fiennes, I doubt that this particular topic is of great interest to him. He's a rich, white bloke. Any children he has will probably not be the victims of the consequences of this batshittery.
And I'm willing to be my Patreon subscription to Blocked and Reported that the 20-something Twitter activists who have been trying to scrub off their Gryffindor tattoos are not the intended audience for his performance of TS Eliot's Four Quartets.
I bet loads of Mumsnetters would love it though.