I would not downplay the few instances where mmr actually triggerred autism as the person above mentioned. In many medicine they say 1 in 100000 can have side effect. But if the ratio is lower and the sode effect is debilitating then we have to avoid it at all cost because you dont wany to be the 1%. It might sound easy for you to brush others suspicions aside or even ridicule it since you will only understand when it happens to you.