Are you making the claim that you can't teach judgement? If so, is judgement and one's capacity for it simply set at birth?

I happen to think judgement is learned, and if it can be learned, it can be taught.

Many professions require their licensees to study a professional code, or go through continuing education on the subject. Even sociopaths understand rules and that following them will keep them out of trouble (i.e. losing their license). This isn't merely blind rule-following, though, because code of conduct rules are not written to account for every ethical scenario.

Ultimately, if it makes sense to teach ethics to licensed professionals, why wouldn't it make sense to teach it to non-licensees?