Anti-vaxxers & sexism

Video version: https://www.youtube.com/watch?v=4Lz1vamBjFA&t=615s   They’re the punchline to jokes on late night talk shows, subject of memes and general scorn. Along with flat earthers, people who don’t vaccinate their children—  dubbed anti-vaxxers— are increasing in numbers and visibility. But: I have some questions. I mean, how did this movement even start? Why did it begin...