in doing your research you've probably come across this thing called herd immunity. the problem is that vaccinations only work if everyone does them. if there are some people who opt out, it runs the chance of a lot more people getting sick, because all of a sudden the entire herd is not immune from a thing. you absolutely have a say in your own health. you absolutely have a say in whether or not a child should be vaccinated to protect the immunity of your community.