If you were in the American slave-holding South in the days of slavery, and a supporter of slavery was demanding studies and ‘evidence’ to justify your argument for ending slavery, would that not strike you as a highly immoral stance?
Losing sight of others’ good intentions is a mistake. Reacting badly, as if truth is obvious and we ourselves are in possession of it, tends to be coercive.
Kohn has a gut feeling that behaviourist dog training techniques are bad, and he is quite right about that. But he has no explanation of why they are and how they are. All he has is (worthless) ‘evidence’ that they are.
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.
How you think people learn informs all your interactions with your children. If you view learning as a creative act in a critical-rational process, you will value highly the idea of consent in decision-making. If you believe people learn through divine revelation or by having knowledge poured into them, that will inform your interactions in a different way from if you think that they learn though conjectures and refutations: you may well think coercion necessary.