There's a lot of misunderstanding about this whole vaccination process. People started refusing vaccines not because they vaccines themselves affected their children but because the mercury based preservatives in those vaccines did. The preservatives are added to multi-doze vaccines, which most of the vaccines manufacturer's have shifted their production, ending most of single doze lines because of much higher profit on multi-doze orders. There was a Rolling Stones article on this a while ago. http://www.autismcoach.com/Rolling%20Stone%20Autism%20Article.htm
Contrary to USA, most European countries ended mercury based vaccines back in the 1970's. Now because of the massive outcry against mercury based preservatives, a lot of vaccines manufacturers have switched to aluminum based ones. But distrust is still there and the lack of single doze is only feeding that mistrust.
Now before you go and say that I don't know what I'm talking about, I have 2 nephews and a niece that became autistic after being given vaccines with thimerisol based preservatives. Each was give multiple vaccines at once, as is often done nowadays and is actually recommended by FDA. Each shot contained enough mercury, that if that amount of mercury was spilled on the floor, it would require a hazmat to clean up. All the children were perfectly fine before that and were really smart and outgoing. This was about 18 years ago.
Another thing to consider is that mercury does not leave the body, it accumulates over lifetime. The only way to remove it, is through some rather aggressive chemo-therapy, so can't be done to young kids. One of my nephews had the process performed on him when he was about 12 and he became much better but the family didn't have the money or the will to put him though several more that were needed to remove the remaining mercury.
Now, not every child is going to have that reaction but you don't know until you try.
So before you go a label these people as complete idiots, try to put yourself in their place...