I hear the critical thinking argument a lot. And I do not find it convincing. You say that it is the responsibility of parents to provide "the other side of the coin" as well. Things that go against their belief system.

Being a teacher in Germany, I can tell you that 32 of our 35 teachers only teach what they belive or what the overlord school system tells them to teach.

There is absolutely no critical thinking involved in what they teach for over 90% of the teachers.

So if 90% of the parents are wrong, I can assure you that 90% of the teachers are also wrong.