I think it should always be the parents choice, or else we are handing the welfare of our children over to the state and that leads to socialist communism.
Parents who are not vaccinating their children obviously have fears regarding the vaccination and until these are addressed, there will unfortunately be children dying because they have not been vaccinated, just like there are parents wondering that if they'd not had their child vaccinated whether they would not have been affected by autism.
There are ingredients in vaccinations that are still worrying for some, such as mercury, aluminium, formaldehyde, etc, and until these fears are dealt with we will continue to have this problem. I had whooping cough as a child we had no vaccinations then. Polio and TB is making a come back in the UK due to the mass influx of unvaccinated immigrants, and cultural differences such as spitting on the street.