Yes, luckily for these people, they live in a region where Polio is uncommon. Most of the world could stop vaccinating their children if they chose to. It'd be

Yes, luckily for these people, they live in a region where Polio is uncommon. Most of the world could stop vaccinating their children if they chose to. It'd be fine. Until the disease spreads to their population and people start to get infected. One case of Polio could quite quickly cause California to become a Polio infected region, like Nigeria, Afghanistan and Pakistan. Then we'd have to deal with that area too. Though without the conviction of other populations, I imagine a once-defiant Western population would quickly revert to willingly accepting the vaccine once they've seen the horrors of the disease with their own eyes.