This seems a bit of a jump to me to say that since Amish people seem to be less likely to develop autism (and lets assume this is true and not that this particular reporter didn't look in the right places) that vaccines cause autism.
I could just as easily say that since Amish people do not watch TV (and that girl from China is likely to have watched TV before being adopted by her Amish parents) that autism is caused by watching TV.
It is very dangerous to make these logical jumps...