I think everyone -including public figures- should be allowed to learn from their mistakes and grow. I think social media can interfere with that and make people refuse to admit error and double down for fear of being cancelled. Ideally this should change.
But, the case of Jo Rowling in particular is egregious. Not only does she refuse to engage with the possibility of being wrong, her bigotry extends beyond words, into concrete, hateful actions where she is fuelling the fire of transphobia worldwide with her influence, both parasocial and financial. That results in misery and suffering for millions. Fuck Jo Rowling.
This condemnation of her doesn't extend to everyone. And if she one day sees the light and walks everything back, then she should get a chance to redeem herself, too.