They do engage in sports, but having a winner and a loser in a game is, IMO, not the same as having a zero-sum mentality. Cultures like this tend to look at sports as a way for people to have fun together, and even if there is a way to win at the game, it's still a win/win activity. But, this is quite likely getting a bit too into the weeds as regards your larger point, so I'll just reiterate that I thoroughly enjoyed your essay.