There are a lot of cases where parents refuse immunisations and/or medical treatments for kids because of their own superstitions and religious beliefs. Some religions do not allow blood transfusion, some believe in natural "medicine" and make belief things like homoeopathy instead of immunisation.
here's an example:
http://www.news.com.au/lifestyle/par...-1226526103657
Do you think parents who are willing to risk children's lives for their own stupid beliefs should have their kids taken away?
It's been over 50 years since the immunisation regime was implemented and has ever since saved countless lives. If some people still refuse to believe immunisation works, clearly such people are too thick to be trusted to raise the children well !