“If there is no validity to their arguments, prove it factually and efficiently”
It has been proven. Furthermore, the guy who originally claimed that vaccines were associated with autism was proven to have been a fraudster; he has lost his medical license. All this is easy to verify on the internet for anyone who doesn’t buy into all the nutty conspiracy theories about government and the pharmaceutical industry, a set of conspiracy theories that have as much basis in fact as the Protocols of the Elders of Zion. Sam2’s point is well taken — it is about as worthwhile to argue with anti-vaxxers as it is to argue with holocaust deniers.