- free vaccinations
- no insurance coverage for treatment if you are not vaccinated
- fines for not vaccinating your children
That leaves stupidity as the only reason not to get vaccinated. Hopefully the money collected from those fines is then used to do something about the stupidity.
If the fines then become an incentive for parents to not treat their children, there should be child abuse laws for not giving your child required medical care that kick in. You could also reverse it, i.e. a tax deduction for vaccination, in case the psychology works better that way.