I don't think it violates the NAP any more than not washing your hands does, or going out in public when you know you're sick. If simply existing in a natural state puts someone else at risk, I chalk that up to nature simply being nature. Perhaps more could have been done to reduce the risk to others, but an individual is under no obligation to do so in order to avoid breaching the NAP.

It worries me how supportive the public in general is of forced vaccinations. Not because I believe vaccines are dangerous, they aren't, but because of the implications it has towards bodily autonomy and the growth in power it gives to the state. The American government has in the past used forced medical procedures for truly abhorrent things such as sterilization, so I don't think its wise to give open that door.

All of that said, vaccinate your kids. Its safe, and its very beneficial not only to you and your children, but to the people around you. Friends and family benefit from it, neighbors benefit, we all benefit. If you have concerns, don't trawl for blogs from unqualified individuals warning you of autism, speak to your doctor about it. Vaccines have been one of the most significant medical advances in human history, probably second only to antibiotics. Even if there was a potential risk, that risk is far less significant than what people risked prior to the use of vaccines.