I went looking for some support for ant-vaxers. This was a top DDG hit <http://traceamounts.com/ten-lies-told-about-mercury-in-vacci..., which was remarkable in its lack of references. The very first claim is

The Facts: The Eli Lilly Material Safety Data Sheet (MSDS) for Thimerosal acknowledges that exposure to Thimerosal in utero and in children can cause “mild to severe mental retardation and mild to severe gross motor impairment.”

Ok, so where is the actual data sheet? You've got a link to it to bavck up this claim, right? Err, No? The rest of it isn't much better.

I actually met my first and only anti-vaxer a few months ago. She quite clearly didn't have a clue about chemistry and wanted to make out this big pharma conspiracy (I used to work in medical trialling so I knew more about the crap that goes on than she ever would). I basically called her a crank.

Seems there is no reasoning with these people because it's not about reason or truth.