Not to get all relativistic[0], but the primary reason we don't actively instill these values is because we no longer look to classical Greco-Roman society for inspiration.
Variously throughout history (Renaissance, Neo-Classical era - Franklin's time, etc.) society has upheld ancient values as the highest. In modern times, they've largely been replaced by scientific values. This was a big debate around Darwin's time (replacing the classical "liberal education" in Latin and Greek with modern scientific study.) It's also increasingly prevalent today, as universities are basically just for career-preparation. The dominant metric when evaluating universities is almost always "earnings following graduation".
[0] I don't necessarily agree or disagree with Classical values, but I do think we should sit down and make our own decisions, rather than blindly do it because Franklin/Plato/etc. says so.
Variously throughout history (Renaissance, Neo-Classical era - Franklin's time, etc.) society has upheld ancient values as the highest. In modern times, they've largely been replaced by scientific values. This was a big debate around Darwin's time (replacing the classical "liberal education" in Latin and Greek with modern scientific study.) It's also increasingly prevalent today, as universities are basically just for career-preparation. The dominant metric when evaluating universities is almost always "earnings following graduation".
[0] I don't necessarily agree or disagree with Classical values, but I do think we should sit down and make our own decisions, rather than blindly do it because Franklin/Plato/etc. says so.