Because it's obviously bullshit. The whole thing originated in a troll post on 4chan instructing people to replace food-related words with child porn-related words - voila, a child-porn conspiracy is born. That is the standard of evidence for PizzaGate: troll posts, and blog entries written by Voat users citing Voat comments as their evidence. Plus no victims have ever been identified. Plus the community is obviously very partisan; see for example how Milo Yianopolous expressed blatant pro-child molestation views but he's still revered; see also how, as soon as an individual becomes known as a political opponent of Donald Trump, they then get smeared as a pedophile. That and members of the community have been imprisoned for being gun-toting, violent nut jobs. And as any adult knows, Satanism isn't real, Satan doesn't exist and people don't worship him. Plus there's a bunch of connections to other obvious lunatic bullshit - the more frequently your community mentions the illuminati, Mossad, CIA, Jews, etc. the less likely there is to be any real substance to the allegations.