Science and logic are the arbiters who is right and wrong. If they cannot support their views with facts, it doesn't matter how right they think they are. If their worldview is sufficiently screwed-up, I support the right for social services to remove children from said home. For example, there should not be an option for parents to take their children out of evolution or sex-ed seminars at school just because it runs contrary to their ideology. Such knowledge is vital for success in today's world, and it should be regarded as abuse to deliberately withhold it.