I agree with you, but I think I can also predict the responses of the anti-vax crowd. To them, they have a strong bias between "naturally-caused" and "human-cau

I agree with you, but I think I can also predict the responses of the anti-vax crowd. To them, they have a strong bias between "naturally-caused" and "human-caused" effects; they would see 21,000 cases of polio as, "Oh dear, well, that's nature (or God), and it's too bad we can't do anything about it." But, transform those 21,000 cases of polio into 2,000 cases of autism, and you get: "Someone did this! Someone inflicted this, this is someone's fault, see, we're not supposed to be messing with nature." From the outside looking in, it's a strange bias, but it's the peculiar result of a sort of comfort in helplessness combined with poor education and a preference for emotional responses over logical thinking.