A Fate Worse Than Death?

I think I've figured out why anti-vaccine parents are willing to accept an increased possibility of contracting occasionally-fatal illnesses in return for a reduction in the chances of being autistic that's somewhere between infinitesimal and non-existent: They regard being abnormal as a fate worse than death.

In possibly-related news, the overwhelming majority of fetuses that test positive for Down Syndrome are aborted. This all fits together.