The Kwanzaa Challenge

I think Kwanzaa is ridiculous. But I think arguments for its ridiculousness which begin “It’s a holiday that somebody just invented” are even more ridiculous. It’s like when people say, “You just made that word up!” My first response is, “Name a word somebody didn’t make up.” Similarly, all holidays are human creations. Kwanzaa is silly, but here’s the challenge: give a solid reason *why* it’s silly besides, “Somebody just made it up.” (I have my own reasons, but I don’t want to short-circuit the Challenge.)