Yes, considering the concept of
herd immunity applies not only to our vulnerable school-age children, but to the public as a whole. I support (obviously) medical exemptions due to allergies to components, weak immune systems that would not benefit from the vaccine, etc., but only on the certification of a MD.
By allowing people to be "conscientious objectors" to vaccines, you're not only causing your child to be susceptible to the illness, but you are also causing everyone else to be susceptible, as when a disease enters a population vaccines are not 100% effective. However, with herd immunity in play (80-90% for most diseases vaccinated), the rate of incidence and virtual effectiveness of the vaccine can be decreased to 0, and increased to 100% respectively.
Note: I voted "yes always" because I support medical exemptions but not religious exemptions, as I have not seen any valid example of a truly "religious" exemption to getting a vaccine, and even still I believe that the benefit far outweighs the small issue at hand. I further think that by permitting religious exemptions, you blur the line between someone who is simply a conscientious objector and someone with a truly held religious objection to the point that you must either ban both or ban neither (exemption, that is).