I agree with what Annie Mac said. For every vaccine, for me, it comes down to a risk/benefit analysis. If there was a small pox outbreak in the US, I wold get my children vaccinated. The risk of the disease is greater than the risk of the vaccine, IMO. If my family was going to live in SE Asia, I would get everyone vaccinated.
In some ways, vaccines are already a class issue. Statistically, the unvaccinated in the US are middle class and educated.