“It is IMPOSSIBLE that genetics alone is the cause of Autism because you can’t go from
1:3,333 cases of autism to 1:50 in 40 years because of genetics.”
Incorrect, it is possible and is observed in other diseases and disorders.
In fact, the sibling rate for autism is significantly higher, this population group contributes to the higher autism overall as a group. If you remove this group the incidence of autism is no where as significant.