I agree with Don. I like competive games. Just becuse a game is 'competitive' doesn't mean it is teaching fighting or conflict. I think competition is an important life skill. (NOT fighting or war- but competion).
I like competition. I find it enjoyable. The more competitive, the
more fun. Now don't get me wrong, game play should always be
gentle(wo)manly, but when people aren't trying their hardest, it
cheapens the whole experience.
In a cooperative game... where's the challenge? You would have to be
against some kind of outside force, which would have to be randomized
and I'm less of a fan of randomized games, and then, even with that,
it's more of a puzzle.