It isn't quite as simple as state-vs-individual in the case of children. I'd normally agree state should never override an individual's choice, but if a parent removes your choice anyway as a child, the point is surely moot...
There is a moral double standard going on here. We quite readily take kids away from parents if dad starts slapping the kids around when he comes home bladdered. Yet we leave them alone if hippy mumsie potentially exposes them and a bunch of other kids to death?