"But why are you telling your children that adults are always right? That's exactly what you're saying, when you tell them "you do as an adult tells you""
I'm not telling them that. I'm pulling rank, within family, in specific circumstances which may not be susceptible to full explanation on the spot. That doesn't mean it can't be explained later, nor that it happens in absence of wider understanding of roles and authority.
I suppose I just don't see it as a clear-cut as OP does.