This. There have been several outbreaks of measles and mumps in the NYC area in the last few years, and the ones put at risk are the infants who are too young to be vaccinated. Vaccines create a "herd immunity" - if the majority of a population are vaccinated against a disease, and that disease is eradicated within that population, it protects the minority (infants, or people with medical conditions or allergies that prevent them from being vaccinated) from catching the disease.
We have friends (who live in CA) who are "selectively vaccinating" their DD. When they first said something about this, we just had to agree not to talk to each other about vaccines because DP & I completely disagree with what they're doing. Our DD's pediatrician follows the AAP recommended schedule of vaccinations and will NOT allow their patients to skip/delay/separate any of them unless there's a significant medical reason to do so. They're very blunt in telling prospective patient parents that if they don't agree with following the vaccine schedule, this is not the right practice for them.
I also think the increase in documented autism cases is largely due to an increase in awareness and diagnosis. When I was a kid 20-30 years ago, a kid with what we now call Aspergers was likely to just be the "weird kid" in the class.