At least in Australia, most parents who don't vaccine their children are hippies, and the suburbs that have recurring measles outbreaks are the most left-leaning suburbs in the entire country.
(But I agree with not bringing political leanings into this; science denial is rampant on both the left and right.)
Post hoc ergo propter hoc.
Not to mention that mercury-based preservatives/anti-bactericals/anti-fungals are now virtually only used in some flu shots; pretty much all vaccines now given to children to not even contain mercury in any form.
This point has already been made here, but I think it's an excellent one: effectively every person I have ever met has been given every vaccine given to children and teenagers as part of our national immunisation program, and many get a flu shot every year (including me). Despite this, I have only met, maybe, two people that I've known to have autism. Even if there were a connection between vaccinations and autism (there's not, and the burden of proof is on those making this claim to provide evidence and illustrate a biological explanation for this), then surely the chance of developing autism as a result of a vaccinations is so low that it doesn't actually matter.