The newest craze sweeping parenthood: not only killing your own child, but taking down families around you.
The Anti-Vaccine Movement is notable for having a shit ton of ridiculous and ugly websites that try to scare parents into letting their children contract highly treatable and usually deadly diseases. There are a lot of ties to the pro-life and anti-vaccination movements, which usually alleges a ridiculous increase in autism because of modern vaccinations:
The anti-vaxxers are not limited to fringe websites, unfortunately. There are quite a few users on tumblr, of all sites, that love to talk about the evils of 'unnatural' vaccinations:
This whole blog is a goldmine on tumblr.
Finally, we have actual books being published for children about why not to vaccinate: