I do think that people need to have a certain level of tolerance with uncomfortable situations/history/even history revision in order to play here. (I'll admit it's one of the things that draws me to it, so I don't think that's a bad thing.)
I admire how the developers have worked pretty diligently to put in some safety bumpers around most everything BUT detailed ones in Asia (but I'm sure after this discussion it's coming). I think there is some risk that some players will conflate real history (especially not really that understood history) and let it inform play, but it seems like that could be handled on a case by case basis. I'm guessing there might be some of that at work here with the Japanese military PC--either they weren't super aware of or assumed that too might have been given some softening by the alternative history view about Hirohito, but I also appreciate that the IRA is not given a lot of press and the crackdown/harsh imprisonment policies in Northern Ireland with the British Government is not in the timeline and presumably has not happened, so we're also not setting up for the Troubles and terrorism either, and given the huge change to women's rights and social status I'm not really certain that war rape is a strategy in-game either on any side. There's not a lot of detailing about how colonialism is playing out now, but I also assume THAT may be gentled as well, in regards to racism and social status.
What I do worry a little about is people leaping to assumptions about the motivations of people playing PCs that would make them uncomfortable if real timelines were kept, and then calling for their heads OOCly. That happens on every game, and if I didn't have a certain amount of tolerance for that sort of thing or tons of "you're not playing it right, listen to me I'm a history major/hobbiest" then I wouldn't be playing here. (Thank goodness there hasn't been much of that if any that I've seen, but I am sure at some point I will!) I love historical themes (but not strict adherence to historical accuracy), I find alternative history really interesting.
I like that there is tension built in, but the intent seems to be very clear to me in looking at the changes made to the culture and the timeline very deliberately make it so that you really aren't going to have people allowed to play gross stuff. I would worry more about it creeping in over time if staff wasn't so obviously invested and responsive.