I don't understand what is so hard about the decisions of some parents not vaccinating their kids.   That is their right to make that decision for the well being of their kids.

BUT, that does not give them the right to put everyone else in jeopardy because of their beliefs. 

(1) If their child is not inoculated for any other reason than medical they shouldn't be allowed to attend public schools.
(2) They don't have the right to endanger the elderly or the very young just because of their beliefs. Measles to that two groups can be fatal or life altering.

Any time one's beliefs infringe on the rights of others or endangers the rights of others that's where those beliefs should end.
 
Of course this is my opinion which exactly all it means.  It is one of my rights and hurts no one.