For me it was sparked by my son being diagnosed as on the Spectrum and prob Autistic after showed signs when he got some shots (ones he didnt need but to get him in school I thought I had too) then I did research and not wanting to put chemicals into my children anymore like formaldehyde, aborted human fetus cells, and so much more. Then the number of vaccines was a concern too, why so many when just in the 80s we did so many less and they are all still alive and not dying of illnesses. I thnk we put too much to fast into the little bodies of the babies. I think they should be decreased and spread out more IMO if given at all. Also why is Autism 1 in 10,000 in Amish communities and like 1 in 500 in other US communities is a wonder I always have Amish dont vaccinate maybe could be why not sure.