I wonder why people cannot accept that some things just are? Autism is. Maybe nothing created it. Maybe I was simply born different. No chemicals ruined my brain. No company conspired to poison children in the name of profits.
Others have written about the mercury myopia sufferers in more detail, tracing the idiots and dangerous charlatans behind this myth. Some people simply are self-deluded, others are truly uneducated. But I think many of the "experts" behind the mercury fears are profiteers, no better than mediums offering to talk to the dead.