For the people who are competitive, not only in a game but also in life, K/D is a way of illustrating ones achievements. Competitiveness is a way of life for some of us; you should not be ranting about players with a different playing style than your own. I understand that you are "trying to have fun" but for some people the game is similar to a single player sport where the person with the most points wins. This being said, for those people who enjoy playing to increase their K/D, being competitive IS having fun.