Yup, the conversations get very emotional. If the vaccines really work there should be no issue: If you or your child are vaccinated against measles, for example, and the vaccines work, it doesn't matter how many people around you don't vaccinate and get the disease, you would be protected, so there would be no reason to be upset at people who choose not to vaccinate. And I haven't yet seen an example of, for example, a measles outbreak, where they report how many of the people who came down with the disease were vaccinated against it (and therefore should have been immune). A difficult and emotional topic. And a political one.