While I'm a supporter of vaccinations for children, it does make me wonder why the parents of vaccinated kids are so worried about those who are not. After all, is that not what the vaccinations are for?

//it does make me wonder why the parents of vaccinated kids are so worried about those who are not. After all, is that not what the vaccinations are for?//

Herd immunity only works if enough of the herd are immunised. If everybody decides they don't need the vaccine because of the herd immunity, a tragedy of the commons occurs and you the herd immunity disappears.

Also, herd immunity only works against communicable diseases. Not all diseases vaccinated against are communicable: you get tetanus from contaminated objects, not people with tetanus.