Reality trumps any number of fallacious arguments made to support a preconceived position based on one or more lies. This is why I am a hard-core empiricist and reject the philosophical school of rationalism, which claims that human reason alone can produce truth. Instead, it has only produced conflict.
Many people are opposed to vaccinating children, fearing that they might be prone to autism as a result. But there is no clear scientific evidence that autism is a cause of vaccinations. People merely ASSUME that because their children’s autism starts soon after their vaccines are administered, but most children who are vaccinated do NOT get autism. If vaccinations caused autism, then nearly all children vaccinated would be autistic, and we would probably have discovered the agent in vaccinations that cause autism by now. Coincidences often happen, but unless the scientific method confirms the existence of an actual cause for something like autism, a coincidence is all it is. Assuming that a coincidence and the hypothesis resulting from it must be the same as a FACT without confirmation is actually magical thinking that is anti-scientific.
While the cause of autism may be questionable, the danger of viral diseases spreading because of children being left unvaccinated is not. Viruses can only reproduce when they have hosts that they can attack. And every time viruses reproduce, they have a chance of mutation. And when they mutate, they are likely to become more deadly, eventually making the vaccinations obsolete. That will never happen if all children are vaccinated, but it might happen eventually if only some are. Of course, once vaccinations become ineffective because of viral mutations, anti-vaccination nuts will claim they were proven right. Thus, their insane claims are irrefutable.
Even if vaccinations DID cause autism in a few cases, it is better for a child to be autistic than to be DEAD! If people like Jenny McCarthy think otherwise, then as far as I am concerned they can rot in hell!