Schools are not intended to moralize a wicked world but to impart knowledge and develop intelligence with only two social aims in mind: prepare to take on one's share in the world's work and perhaps in addition lend a hand in improving society after schooling is done.
It is no great art to say something briefly when like Tacitus one has something to say when one has nothing to say however and none the less writes a whole book and makes truth into a liar - that I call an achievement.