What's there to discuss? Buying HP media hurts people, and emboldens the person doing the harm. I'm not obligated to care how Rowling's broken morality works or put in any effort to fix it.
If I may, I think there are two points worth making here. The first one being that any money she makes off the franchise goes to her crusade against trans people. In that sense, it is true that anyone who knows this and still spends money on the franchise is making a choice that endorses her views.
The second point is that it ultimately *doesn't* matter if any of us actually agrees with her or not. She thinks any money she makes is a justification that her views are popular, and she is the one making said money, so she is going to use it accordingly.
My input as a consumer begins and ends with my money, because that is the only part she is going to listen to, and it's also the material she uses to enforce her views. Anything else has no material impact whatsoever.
So, yeah, anyone can theoretically give her money while disagreeing with her opinions. But, in practice, that money is going to physically and materially be used for the sake of her hateful views, and anything the consumer might think goes uncommunicated anyway.
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Personally, I doubt that she is correct but also believe its immaterial regardless. So bringing it up is needlessly distracting.