She’s a lower class Brit who did something unpardonable in the eyes of the upper class Brits. She produced a product that became popular & made her wealthy. In many cases far wealthier then those in the upper class. (Which makes it even more unpardonable!) So she has to spend the rest of life being ashamed of her success and more leftist then any of them. If she doesn’t the Nobs will all look down their collective noses at her and cluck their tongues at the dinner parties and such. Things that Rowling has likely spent her whole life dying to attend.
I actually don’t know her but I’ve seen this kind of behavior before. Her actions fit those I do know who did similar things.
She’e a virtue signaling hypocrite among her other qualities. A few years ago she declared the beloved head of the fictional magical school was a Homosexual. So when the millions of children read her books they can think about that.