As a parent of an encephalopathic child (so-called "Austism spectrum") you come into contact with a lot of crazies. There's a "theory" put forward by a father/son duo of scientists-cum-professional-witnesses that Autism is linked to mercury preservatives in vaccines. Robert F. Kennedy Jr. until recently evangelized this point of view, saying that big pharma is part of some sort of conspiracy to harm your children. RFK has since divorced himself from this viewpoint, and the "scientists" have had their funding yanked. Not to mention, the preservative has not been part of vaccines in the US since circa 2001. But parents, particularly those with at least one Autistic child, are not vaccinating their kids. If you tell them that the mercury preservative is gone, they'll tell you they have "heard of this time that someone's doctor lied to them." So many parents are opting to take on the very real danger of these deadly diseases in favor of the smoke and mirrors about Autism. Oh, and both my kids have been vaccinated.