We may subscribe to the values of rationality and taking children seriously, but when it comes to detail, we may well be mistaken about particular aspects of it. So instilling anything, including those ideas we most value, is a mistake. We want our ideas to be corrected. We want our children to be able to correct our errors, not be saddled with them.
There is every reason for hope! And the fact that we have noticed that coercing our children is problematic is progress compared to how things were in the static society of the past. (And hey, maybe the fact that coercionists these days seem to feel more need to justify their advocacy of coercion is itself progress?)
How does the alleged parent’ right of authority justify behaviours we would in other circumstances regard as barbaric, immoral, or at the very least unpleasant?
One of the common responses to coercion is to lose interest—to no longer care—about the thing you previously cared about but were coerced out of or whatever. That is not really surprising if you think about it. That was the whole point of the coercion. To force the child to no longer value that thing. In order to not feel distress, the child has to change her values, to not value that thing any more. This is a change for the worse, by her own standards.