It's their kid, so I find it unsurprising that parents are simply skipping the vaccines as long as there's the shadow of a doubt.
But that's just the thing. There's the shadow of a doubt both ways! Why is the one better than the other? Well that's easy, it's because measles sounds like something from a fairy tale, whereas autism immediately conjures up evening-news images of blank-faced kids spinning plates.
This is something that has annoyed me for some time now: the idea of "playing it safe" has been hijacked and now means "favoring the danger I'm more familiar with". 99% of the time, when someone tries to "play it safe" or "err on the side of caution" all they end up doing is accepting a greater but more familiar risk. Just because it makes you more comfortable doesn't mean it's the smart move!
A great example of this when it comes to parenting is the current scare about child predators and the almost complete destruction of childhood independence. That article a few months ago by a mother who let her boy take the NYC subway alone shows exactly what I'm talking about. Everybody freaked out about this "dangerous" ride she let him take. But in fact the risk to him was absolutely minimal, and nobody was thinking about the risk should he be sheltered to the point where he grows up stunted and is thereby never able to accomplish anything with his life, something which I fear will start to happen to millions of children when they face maturity in another decade or so.
So don't let people take this cop-out. If the facts support one decision as being safer then that's reasonable. But refusing vaccines isn't playing it safe or avoiding the shadow of a doubt, it's cowardly destroying public health because parents are incapable of acting rationally.