^ Some players value team solidarity over fairness. With many players it is often a matter of pride or "saving face". If one players makes a call, it is up to their partner to support their call so that they are not embarrassed or "lose face". With many players, this concept of "saving face" is a strong cultural imperative. In most American and many Euro cultures, the concept of sportstsmanship or "fair play" is a strong moral imperative -- greater than the idea of "saving face".
Every tool is a weapon -- if you hold it right. (~Ani DiFranco)