Narcissism-out-of-school was a huge problem for me personally, decades ago. I had good grades from good schools but could have used a better set of "mirror neurons".
In particular I remember always being vocal that code ought to be rewritten because it didn't look pretty. Learning-by-hard-knocks to have some respect for legacy-wisdom is such a painful memory, not least because being-rejected-by-team-mates due to such LACK of respect I now realize was justified.
I wonder what is the earliest age at which kids are capable of learning bargaining concepts ? "The Power of a Positive No" is such a great book, author Ury is still sharp. I speculate that he might round out his career with a children's book targeted at this age. The "BATNA for kids" course might start out with a screening of "Shipbreakers of Bangladesh", my favorite CBS video on global-economics.