At 10 April the UN General Assembly held a thematic debate on whether international tribunals contribute to peace - a conference that was boycotted by the US. One interesting speaker was John Laughland who talked about the the lost art of peace.
Core of his argument is that in the past all peace treaties used to have clauses of reconciliation in which both sides renounce all claims on the other side for events that happened during the conflict. Even many treaties where there was a hierarchical relationship between the parties contain such a clause. The Treaty of Versailles that ended World War I ended this tradition.