at least insults aren't contrary to the purpose of the game :P though certainly not good strategy.
it may not be realistic that every player on this sight will prize victory above points, but that depends on what you do - it depends on your action, and hopefully your informed action.
and yes, i'm sure that the people who do make the choice to deliberately lose to save a few points are lovely people outside the game and not worthy of playground namecalling, but for the purposes of a game whose objective is victory, it sucks. why are you choosing to do this? it is not the end of the world, this does not happenall the time, it doesn't hurt me bad, but seriously, why are you making this choice that is antithetical to the reason we are playing this game?
yes, you can win an election with a rigged voting machine, you can steal that ring while the jeweler's back is turned, you can lie to your lover when you know you can get away with it - and these things will always happen as in playing-to-lose-diplomacy - but i think raising this issue, at least in part, brings up the discussion of the design of the game. as just one facet of the game, diplomacy is designed for that situation in which you have two units and a couple of other countries have one or three units and you have to work together to strategize - and if you lose then, that is honor. it is designed for you to make the tough choice and risk elimination, not to piggyback off of somebody else. if you just suckle at the teet of the winner, it is like the opposite of the reason that this game exists. it is supposed to be about your self-interest, and the only self-interest that this game has as its objective is victory.