Thats BS. If I choose not to vac my son from say the measles, how is that affecting anyone? According to you vaccers, you are vaccinated so what will my non vaccinated son do to your vaccinated son? If your son gets it then obviously the vaccines dont work.
While vaccinations are extremely effective overall, they are not 100%. This is why herd immunity is important. If a vaccine is say, 90% effective, even if one person falls ill it's extremely difficult to keep passing it to new people. Since they are not 100% effective, your irresponsible decision impacts me as it makes it more likely that I will come into contact with an infected person.
Additionally, children under a certain age are too young to be vaccinated and therefore your unvaccinated children present a direct threat to them.
That's why it's our business.