Curiosity question, why does it matter so much if someone doesn't vaccinate? I mean if everybody else is vaccinated, they (those who are vaccinated) shouldn't have to worry about getting sick. right?
Some people with weakend immune systems from things like cancer can't get vaccinations. So when someone else becomes a carrier because they didn't get vaccinated they can pass it onto that person and kill them.
Basically, vaccination creates a fence that stops diseases from spreading. If people don't vaccinate, it creates holes in the fences, and plenty of dangerous strains can pass through those gaps.
Oh wait, that goes by any logic.