I know it must suck for you who have probably put thousands of mercury fillings in hundreds of mouths to consider that there might possibly, however small, be a negative factor involved. You might even feel defrauded yourself. After all, you were supposed to know everything.
But please, stop telling parents to not seek INFORMED treatment for their autistic children, many of whom CAN be helped, because you don't want to have to feel guilty about mercury fillings.