As a member of that society I have the right to benefit from our collective efforts because those efforts were done for me, for you, for everyone, without exclusion. These things were given to us by our ancestors, by our governments, by our own individual contributions.
Right now there are people working tirelessly and facing extreme risk to elininate the tiniest pockets of polio in the world. They are killed on a worryingly regular basis because of a form of anti-vaxx sentiment: http://www.bbc.com/news/world-asia-36090891
If you're a staunch libertarian your position should be that I can do whatever I want so long as I don't infringe upon your rights, and one of the most fundamental rights is a right to live and do what I please.
Unvaccinated people can strip you of your right to live.