[The Californian]

So, actually, someone could decide for himself that he will rely on the fact that he will never be exposed to the disease in his life, and avoid the pain/ possible side-effects of the shots and just coast on the situation provided by others eradicating the disease from the population.

Actually, my unvaccinnated kids were exposed to a LOT of the diseases that the vacines should cover. Yes, they got chicken pox and slight cases of some of the other diseases, however, it was certainly better than permanent disablement. We stopped the vaccine program on the strong advice of our very good physician because of the side effects on one of our kids. The side effects he had suggested a contraindication for further vaccinations, for him or any other children from the same parents. A good immune system is generally a better way to go.

[Sarah]

I know of the American Network Chiropractic's (and many homeopaths, naturopaths, accupuncturists') school of thought (immune system vs. vaccination) and I understand the reluctance to vaccinate (we did them as late as possible as I also noticed difficult side effects, which are much lighter as the child ages.) Here in France they have something called Ostheopathy which is more advanced than any Chiropractic that I found in the States, but they don't even attempt to dissuade vaccination.
Just know that you are lucky that Polio, German Measles, and Small Pox are no longer a threat for your kids, due to the mandatory vaccination program in much of the world.
This is not really a criticism of your not vaccinating your children, but, like the original subject of the post, an attempt to reconcile the desires and needs of the individual with the good of society. (ie: other individuals...)
Best, Sarah