You keep hearing about flat-earth only because it is so ridiculous. There are not a lot of people who believe in it. As for "anti-vaxxers", this is a position

You keep hearing about flat-earth only because it is so ridiculous. There are not a lot of people who believe in it. As for "anti-vaxxers", this is a position rather than a conspiracy. Do you have something specific in mind? (such as the autism thing?) I do not know about Pizzagate specifically but there is a lot of evidence for sexual abuse by powerful people (epstein is just one recent example).