Here's the Wikipedia explanation for the pseudo-science belief that vaccination "causes" autism:
Parents may first become aware of autistic symptoms in their child around the time of a routine vaccination, and this has given rise to theories that vaccines or their preservatives cause autism, which was fueled by a scientific study which has since been proven to have been falsified. Although these theories lack convincing scientific evidence and are biologically implausible, parental concern about autism has led to lower rates of childhood immunizations and higher likelihood of measles outbreaks in some areas.I find it odd that I was raised in "the modern" era but:
- A shocking number of people really have no clear idea of the scientific method, how science works, or the benefits of science.
- An amazing number of people are busy marching back into the medieval past under such banners as "post-modernism" and "new age religion" and various "religious fundamentalist" organizations.