[zdean]

And furthermore, if the concern is that unvaccinated children are putting others at risk and should be excluded from school, then wouldn't it stand to reason that this child (who is also unvaccinated) is also putting others at risk (albeit the motivation for not vaccinating is different)?

[jrochkind1]

http://en.wikipedia.org/wiki/Herd_immunity

Public health is inherently a community thing, cause contagious diseases are transmitted socially, that's just how it works. If everyone who can be vaccinated is, then those who can't are much safer.