The thing I don't get is how a parent can look at their child and thing "I'd rather risk you dying a horrible feverous death, than possibly be a bit autistic".
Especially when you consider things like Measles can cause Encephalitis, which in turn can cause seizures, personality changes, memory loss, epilepsy, and in 10% of cases, death.
Like, autism is pretty damn minor in comparison to almost anything else you could get in your life.