I subscribe to an idea first articulated on the 'Free-Range Kids' blog's comments section that if a risk is, statistically, less common than the likelihood of me (a) getting into a car accident (b) with the kid in the car (c) before the kid is in high school, I label it a 'negligible risk' and refuse to rejigger my whoooooole life to avoid it. Vax-caused autism is one such. So are a lot of other things I see obsessed about on momsites.