Ethics lessons, behavioural training, 'learning by doing', internationalism, etc. There are many ways of teaching morality.
Including brainwashing, of course.
Also, as for the post ACIN replied to:
In order for an agent to take an action, it needs both the opportunity AND the motivation to take that action. Democracy has few safeguards against mob rule and anarchy; sure. There is plenty of opportunity to oppress within a democracy. But as Tocqueville argued, democracy also removes the motivation to oppress. That's why democracy simply will not decend into mob rule and anarchy.
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