Mandatory Vaccinations?

At first thought, one's instinct would be to protect a parent's right to raise his/her child in a way seen fit to that family -- not according to what the government thinks is best.

However, as a health care professional, I'm confident in my assurance that arguments against vaccination have been thoroughly refuted. The benefits of being vaccinated far outweigh the risks; I sometimes wonder if people don't take for granted the fact that advancements in vaccine development are responsible for making such diseases as polio and whooping cough either relics of the past or extremely rare.

When parents decide not to vaccinate because the fear adverse effects, do they also consider the possibility that their child-- however improbably-- might become seriously ill from one of these diseases? Supposing their un-vaccinated child makes another child ill? Should the parent then be held responsible?