There's a particular element of his fans who show up on the subreddits wibbling on about Death of the Author theory and separating the art from the artist. On one level it's obviously NG fans who want to continue enjoying his work while appearing socially virtuous...
Yet there's the compulsive urge to make JKR the greatest villain of all.
I can't help but be reminded of those YouTubers who spend five minutes at the start of a video slamming JKR before gleefully showing off all their Harry Potter merch.
I suspect quite a few of them come from that slightly mad element of the HP fandom who formed a parasocial attachment to JKR, then turned against her when mummy said something mean. And they've transferred their parasocial attachment to the cool uncle who agrees with all their opinions, and whose "dark" and "edgy" stories make them feel grown up, and they never gave a thought as to whether the cool uncle would be dodgy.