This is tangential to the whole Hogwarts Legacy thing, but I think Jacob Geller made a fairly good point about the relation between fiction and media and real-world violence in his video on the history of the headshot. Essentially, his argument isn’t that people will see a violent thing on TV or in a game and decide, “Yeah, that’s a cool thing to do.” Rather, it is the types and modes of violence that fosters misconceptions and differing attitudes about violence. The keystone example here is the headshot. People who played games that put high values on headshots tended to believe that police officers aiming for the head was a part of normal procedure, even though in reality aiming for the body is standard across police forces and the military barring the extremely specific case of a hostage scenario gone wrong. Even snipers - the people in media we most associate with shooting people in the head - are trained to aim for the center of mass.
(This isn’t actually for any, like, lifesaving reason. Rather, aiming for the head makes you miss a lot, and even with modern body armor a gunshot to the chest can take people out of the fight. At least as I understand it.)
Just an aside that I thought you might find interesting. As for Legacy itself I have… a bit of a different view than you. I understand your central complaint of the fact that Legacy won’t actually change anyone’s mind on much of anything. I think that’s… probably true? But what is more pertinent to me is the shitstorm around it; I’ve noted several notable trans people online getting death threats and harassment for speaking up about what they find objectionable in the game. I think that sort of speaks to the cultural momentum that the game has acquired, where even if it was entirely benign in content, it has by association acquired a fanbase with a sizable transphobic audience. That strikes me as far more concerning, because while I wouldn’t describe my trans friends online as notable nor would I describe myself as notable, I also just don’t want high concentrations of people who would send death threats to me, my friends or people like me or really just to people in general.
it's true, when people have no real-life knowledge or examples they often turn to media. i don't think that media is really more or less important than regular communication between people. (the most reliable means of taking someone down is shooting them more than once!)
I think even without jkr's bullshit the mass, mass audience of a harry potter game would create opportunities for the worst kind of harassment - criticism regardless of content would be met with abuse. with her terf stuff, and the right-wing coverage, people have made the game into a culture war target and drawn in people who might otherwise not be interested to argue about it and harass people criticizing it. this has the potential to gestate a lot of very angry hate mobs and i do not blame you for being upset and/or worried or what have you. it's become a very nasty internet phenomenon for some of the worst parts of the modern culture war.
however i would say that i think the vast majority of harry potter game enjoyers are mostly offline harry potter fans who just like wizard stuff. this is an online phenomenon for very political people, and regardless of whether the shitstorm happened or not it would still be selling like hotcakes.