Observations and rationalization for my own hypocrisy

I believe the Anti-vaccine autism crusaders are nutballs. That's not based on any thorough analysis. Sure, sure, the mercury-based preservatives they used to use were hard on a kid's immune system. And sure, if my kid got a shot, and shortly thereafter I noticed ASD symptoms, I'd see the chronological corellation and assume causality. But I think it's been thoroughly tested by trusted authorities whose only incentive to lie is this: the consequences of an unvaccinated society are likely greater than the risk of vaccine-induced ASD. That's not enough to buy off *all* of the reputable scientists.
So, count me as a scientific skeptic. Except...
The government also tells us there's no significant/measurable difference between the milk from cows treated with rBST, and those who aren't. Still, I almost uniformly choose the non-rBST cow-produced milk for my family.
It could be:
- because the cost is the same
- because I have some ethical lines I refuse to cross (somehow, impregnating an animal so we can steal her milk doesn't bother me)
- because there is a great incentive for the "evil milk lobby" to find no measurable difference...it leads to cheaper milk production. It's the Wal-martizatio of a staple!
But it's none of those. I honestly don't know why my knee-jerk scientific skepticism kicks in, in one situation, and does not, in another...
Subtlety is not one of my strengths