There are people who don't vaccinate that aren't conspiracy nuts. I think for some people the fear of having a bad reaction or needles (valid fears, IMO) makes them more vulnerable to the idea that they'll probably be fine avoiding them, sadly. People feel false reassurance from seeing other families saying they don't vaccinate and none of them have died.

I personally hate getting them and I have to force myself. If I had been raised to believe they were harmful I wouldn't have gone out of my way to question it.