Coercion impedes progress by impairing error-correcting processes. “The right of the parent over his child lies either in his superior strength or his superior reason. If in his strength, we have only to apply this right universally, in order to drive all morality out of the world. If in his reason, in that reason let him confide.”
We believe that it possible for human beings, through conjecture, reason and criticism, to come to know and understand truths about the world, including truths about the human condition and about specific people, and including truths about matters that are not experimentally testable. We do not believe that we possess the final truth about any of these matters, but we do believe that our successive theories can become objectively truer—with more true implications and fewer errors.
Children have to do what they themselves think is right, with no pressure whatsoever—that’s what non-coercion amounts to—but they also have a right to be told morality as best we see it.
Karl Popper’s theory prevails because it solves problems other theories of the growth of knowledge fail to solve, it is a better explanation than its rivals, and it unifies ideas previously thought to be unconnected.
Coercion is stressful because it conflicts with most people’s wider ideas about morality, human relationships, and how to run a society, etc. Unless one mentions children or parenting, everyone agrees that consent-based solutions are better that coercion every time. That theory is held on some level by most people. They just suppress it in their parenting.
There is no point demanding testability of an educational theory. What one can do with philosophical theories, is refute them by argument. Empirical testing is just one of a number of types of intersubjective criticism, and the vast majority of all criticism is by argument, even in science. Most scientific theories are refuted before they even get to the stage of empirical testing.
Any rational system has virtually no knowledge compared with what is possible. The whole point of rationality is what to do in the face of ignorance. It is not what to do when one already knows everything.