Bayer sold vaccinations that were tainted with HIV; why would this be so much harder to swallow for some people?
Fact of the matter is this has come up in congressional hearings and by the CDC itself this year on their website which they have since taken down. The archived page is still viewable though.
http://web.archive.org/web/20130522...pdates/archive/polio_and_cancer_factsheet.htm
It is just one form of systematic population control. There are many.