So essentially they were instead supposed to be going up to kids and saying, 'Look, this mass genocide is like Hitler (whom, as you know, was genocidal, deep), feel bad about it, etc.' This, of course, in lieu of the less likely mode of including 'mass genocide' because it is 'shocking' or 'edgy,' and people are supposed to like the games for this reason, which is essentially to just include them because the audience likes mass genocide and are being encouraged to do so. Obviously, the condemnation of mass genocide is neither edgy nor shocking, and most kids would be aware of this although many adults seemed not to notice, so ultimately that's just resting the game on its promotion of mass genocide.
In any case, the Nazis came from Germany after being oppressed within it, having a populace held down by a few, and then suffering national sanctions, not to mention Hitler's own punishment, they weren't there because they were happy helpful people, which is if anything more childish than the overall plot. Social and political history is not just random atomised feelings. It's a fairly trite point, but in any case I doubt that most fans (or the account whom you were responding to) were that concerned about the licensing of Pokemon games, it isn't a 50 Cent album. If people were supposed to dislike the 'bad guys' for reasons other than the game trying to scream that they're bad, then that might count as 'mature' in a discursive sense.