How do "increased moral" and "no one trusts each other" go together? I almost always leave a game of Diplomacy feeling really upset, but maybe that's just an indication that I don't have a good ability to separate in-game relationships from reality?
We play similar games in our Scout troop. When they're done I ask the boys "We were willing to do that and it was just a game. What lengths would we go to if it was about something that really mattered? Think about it"