More realizes that his quasi-ideal society is only ideal because the population of Utopia is NOT ideal. More accepts humans completely and understands their flaws. Instead of trying to create a society with perfect people, he creates a society that will best serve imperfect people. Utopia shows its inhabitants that immorality is irrational and teaches them to think rationally. More acknowledges that people will always act in their own best interests, but develops a society that formulates its institutions so that an individual's best interest is also the best interest of the community.
