Addressing only one of your statements: Japan stopping using their own domestic MMR, but split it into several different vaccines (and the mumps and measles vac

Addressing only one of your statements: Japan stopping using their own domestic MMR, but split it into several different vaccines (and the mumps and measles vaccines have been combined back). It was not the vaccine used in the US or UK and the underlying epidemiological condition was meningitis, not autism. Rates of autism continued to increase in Japan after the triple vaccine was stopped (personally I suspect this is more due to increasing awareness and changing definitions of autism than any iatrogenic cause. I feel like of all the issues and problems in medical research, chasing after vaccine/autism association is one of the less likely to bear any useful fruit.