Because there is no "truth" about Kwanzaa. It's not some fucking conspiracy theory to wipe christians off the planet, it's not a secret lie. Yes, I know you white crusaders are just salivating for another battle, but sadly this isn't one.
Its origins are radical, distasteful, and offensive. But when was this created? The 60s, the last decade of black hatred, and one of the most powerful. Kwanzaa is the only third alternative, and a necessary one. America isn't just Jews and whites, we also got negroes on this land. They want something too, and they have it. So stop being assholes and recognize the holiday for what it is, not what it was meant to be; that is a bitter response to racism and oppression.
Do people look back on Martin Luthor King and say "that fucking radical whiny activist nigger"? No, because he changed things. Kwanzaa didn't change much, so give it some slack you oppressed white supremacist capitalist pigs.