Not getting vaccines is laughable and largely stupid. Say you're headed off to college. You need to get the meningitis vaccine if you're living in the dorms. If you decide to not get vaccinated, and you get Bacterial Meningitis, then well, sucks to be you. If you don't get the proper vaccinations you can pose a threat to not only your own health, but the health of others.
The laws saying you have to be vaccinated are largely a product of an older time when these diseases could run rampant through urban population centers. Look at what Polio did in the 1930's-50's.