Besides the Milgram experiment, Soloman Asch's conformity experiments, Zombardo's Stanford Prison study, the innocent bystander and the fundamental attribution error should all be required for politicians writing laws, police enforcing them, prosecutors bringing charges against people using them and judges meting out the final judgement. Possibly even jurors should be required to learn about those basic psychological principles before sitting in on a trial. You could cover all of them for the jurors in 2 days I reckon.
