If you're open to a dark academic thriller, 'The Secret History' touches on this, though it's not the central focus. The charismatic classics professor, Julian Morrow, selectively admires his small group of students, creating an insulated, elitist world. The ethical breach is in fostering a sense of intellectual and moral superiority that directly enables tragedy. It's a case study in how a teacher’s aesthetic and philosophical ideals, removed from real-world ethics, can be catastrophically destructive to impressionable minds.