The fact is, most Harry Potter fans neither know nor care about any of the personal exploits of the author.
If she kept that a secret or anything then sure… But it’s not exactly a hidden fact that money gained from Harry Potter is being put towards hate.
The spaces you hang out in obviously make a big deal of these and broadcast them consistently, I’m sure. But it’s clear you spend enough time in them that you’ve lost perspective in how things are in the ‘world at large’.
Although it’s very obvious and “not hidden”, to you, it wouldn’t even have to be hidden from the average Harry Potter fan, because they make literally zero effort to seek it out. They simply don’t care about anything she does, outside of writing the books they like to read.
P.S. The way you worded it in a previous comment implies heavily that a lack of explicit criticism of Rowling is equivalent to “support”. It isn’t.