Exactly! No-one really needs to support the shitty TERF anymore. But the problem is that HP is such a cultural phenomenon - many many of my friends have no idea how awful JKR is, they know the books (might have read them but not necessarily) and the kids want to read the books/watch the movies because other kids in their classes have done so and talk about it.
Like, in mainstream German media, you don't get anything about JKR supporting TERF shit (you don't get all that much UK politics in general besides the Royals and prime minister drama/Brexit stuff).

I've heard good things about the Percy Jackson books too, and with the new tv series, it might see a resurgence.