It seems that people have forgotten the autism/thiomersal hysteria of a few years back -- just in time to deliver a generation of unvaccinated kiddos into our schools. Unfortunately, the "thiomersal-autism-link" was promoted loudly by people like the well-meaning, but misinformed Jenny McCarthy as panicked parents sought answers for the "autism outbreak". Autsim is heavily over-represented in families that have engineers as family members. See this article from Scientific American (paywall, sorry): http://www.scientificamerican....
The referenced UK survey showed that families with engineers in them can have between 2.5 to 8.6 *times* the statistical occurrence of autism in their children. Even though the whole thiomersal-autism link has been debunked, in the intervening time a lot of people have sadly opted out of vaccinating their kids -- better "safe-than-sorry" seemed the prevailing wisdom -- until science can make a ruling on it, right? After all, when was the last time a kid came down with measles?
...This against the backdrop of seeing kids with a life-long devastating condition like autism -- nearly every family I know in Silicon Valley knows one or more families that are stricken with it. I personally know over half a dozen, including my own son.
Unfortunately, the success of vaccinations seems to have been blunted everyone's memory of why we did it in the first place.
As parents, all of us try to make the best decisions based on the most current studies/data available, but the tragedy is that current prevailing wisdom failed us on this one.