GOOD GUY bad guy

talking all these theories this week has got me thinking: america as a whole tends to always take the view and appreciate and enjoy the view of good guy bad guy. If it's in politics, you like your candidate your voting for, the good guy, and you hate the other, the bad guy, and follow appropriate news stations and discussions. In sports, we (the red sox) are the good guys and the yankees are the bad guys. In TV or movies you are rooting for the good guys and as the plot develops you want those good guys to stick it to the bad guys, preferably violently. Why is that? has our society molded us to be far too competitive and violent against one another. I think Levi-Strauss' theory had it all wrong. Can't we all just get along??