I'm curious -- how "fringe" is this theory? That is, how common is the belief that the Holocaust did not happen? Day after day I'm amazed at the lack of knowled

I'm curious -- how "fringe" is this theory? That is, how common is the belief that the Holocaust did not happen? Day after day I'm amazed at the lack of knowledge across the world? A few weeks ago, I would not have thought that something like this were necessary. But now...