My main problem is giving money to J.K Rowling. There is nothing stopping anyone from liking the Harry Potter series and I would never force anyone to stop. I really liked the books. The franchise was fun. But I can't give her any of my money.
Now yes you can say that about any company. All corporations have dark secrets. No matter what you buy you are likely supporting someone horrible. Yet in those cases its a faceless someone. In the case of the Harry Potter franchise it's a very public figure who makes her to views known, who will respond to people and make things worse.
The game will sell millions of copies, it will be a huge success even if the quality is bad. And its looking like a good game. Most Harry Potter fans have separated the franchise from the person and are just ignoring the detail that they are giving her their money. I'm not doing that but that's my choice.
Ban Harry Potter if you want, buy new merchandise if you want.