Fully agree; I bet you anything that if a genuine epidemic of polio (likely since it has hit Europe, the Middle East, and Africa) hit the US, these very idealists would be screaming about how the government didn’t do enough to protect their vaccine free spud.
I'm not so sure. Part of their vaccine-free lifestyle involves a serious disregard for the health and well-being of others. Polio does not make everyone seriously ill--only about 1 in 200. Unless their kid is that one in 200 who actually becomes disabled from polio, they won't care. We've already seen this where whooping cough outbreaks have occurred in strongly anti-vax areas--these people don't even care about protecting their own children, much less other people's children.
Some of us are friends with people who got polio from the vaccination.