I can forgive them having a different opinion, they don't have her life experience or her research into the topic. They also have careers vulnerable to cancel culture and perhaps hard for them to see outside the acting culture they have been raised in.
Where I really struggle with them (and indeed with any Harry Potter fans) who have distanced themselves from JKR is that surely if you've read the books, and know JKR, surely you'd look at what people are accusing her of and think, hold on a minute, and look into exactly what she's saying and try to understand her POV. Even if after giving her the benefit of the doubt you ultimately you disagree with her, surely you'd understand that she's trying to help women and children and see her as mistaken rather than an evil bigot?
I know it's possible for writers to diverge from the messages in their own work - Philip Pullman's Bolvangar and League of St Alexander couldn't be better critiques of blocking puberty and the current climate of fear in schools about wrong-think if he had planned them!
But I feel Jo earned at least an attempt to understand her position and to assume good intent (even if they ultimately disagreed about the risks or whatever) rather than a summary dismissal and distancing.
More concerning than his actual twitter comments, Daniel took part in a video thing where a child was talking about how they knew they were trans from a young age because they liked toys and activities (stereotypically associated with the opposite sex). I couldn't understand how an adult with an adult's experience of how diverse individuals can be, could watch a child say that and not question at all whether that was sufficient to justify medical transition (privately afterwards if not in front of the child) and distance themselves from the whole thing, rather than release the video and double down.