I've seen a variety of analogies used in order to justify your use of Kristallnacht (in addition to a variety of attempts by your supporters to "other" the people who find the use offensive in order to more easily dismiss all the naysayers).

So, just to clear up any possible misunderstandings, and get in my two cents worth, here is a clue-by-four.

There is a vast sea of difference between alluding to broad concepts of genocide, slavery, discrimination, and the corruption of power, in order to help educate children about the moralities of such things, like Rowling did, and specifically co-opting a historical event sparked a mass genocide in order to play a game.

Moreover, there is a vast sea of difference between a role playing game that essentially turns Muggles into Jews and Grimwald into Hitler and other literary works like Schindler's List and Night. Your RPG is not comparable to these types of works. At all. For a variety of reasons, starting with the fact that Schindler's List and Night weren't created in order to help fans get their RPG jollies off. You didn't select Kristallnacht, as a name and a setting, in order to meaningfully explore what Kristallnacht means, both to Jews, and to the world. You didn't select Kristallnacht in order to explore, in any meaningful way, the historical significance behind Kristallnacht and its place in the history of WWII and the Holocaust.

I'm going to take an educated guess and surmise that you selected Kristallnacht because you thought it would be really cool to turn Muggles into Jews and Grindelwald into Hitler and the Nazis, and see what other really cool things you guys could come up with, based on that premise.

And, that's why people are pitching a fit over your game. Because you are co-opting a historical event that spurred, promoted, and justified the attempted (and almost successful) genocide of an entire people. And, you're doing this for an RPG game. And, you apparently thought of, but didn't care enough about how and why that might affect and hurt other members of fandom.

Or, you didn't care enough.

That's the bottom line. You getting to have fun takes precedence over the feelings of the people whose tragic event you co-opted.

And, that is why your RPG name, the premise of your RPG, and your response to criticisms over your RPG name and premise, is made of fail.

Not because you're some jerkoff on the internet who likes to get off by RPGing genocide. But, because you thought about what you were doing, and you just didn't give ENOUGH of a damn.

You've said everything more clearly than I could possibly manage, so thank you for that. Hopefully the mods/players will read your post.