Parents who choose not to vaccinate their children are being selfish and thinking only about themselves. Yes, YOUR child might be able to fight off an infection, but one of the main reasons that we vaccinate is keep diseases eradicated and to protect those people who cannot mount an immune response to diseases. Since parents have been deciding to not vaccinate their kids recently, we've seen a rise in the incidence of diseases that had previously been eradicated. That might be OK for a healthy, hearty child, but what about a child who is on immunosuppressants because of a transplant, or the elderly? Parents think its this great thing that their kid fought off a disease naturally, e.g whopping cough, but that's not what it's about!! It's about create an environment that is free of life threatening illness. How do you know your kid didn't pass this bacteria (yes, whooping cough is a bacteria, not a virus) on to someone who wasn't able to fight it off? Are you OK knowing that your negligence may have killed someone? And yes, we haven't seen Polio in the US in a long time; however, it still exists in other countries and its only a matter of time, with travel and immigration, that it starts to resurface in this country. As will all the diseases we've fought so hard to eradicate.
No one is saying that YOUR child cant fight off diseases naturally. I'm sure they'll be just fine. But there are other people out there who can't. Vaccinating is part of our inherent social contract. If you want to go live in the woods, away from society, then feel free to do what you want. But if you want to be contributing members of society, vaccinate your kids. Nothing is 100% fail proof in medicine. Nothing. Vaccines have risks, as does nearly every other medication out there, but the benefits COMPLETELY outweigh the risk. I'll take 1000 kids with "mother diagnosed autism" over the alternative any day.