Groups are meant to make alliances with groups that are close to them, geographically, ideologically, morally, and racially. How can alliances be formed with people who share zero commonality or shared goals? Answer: they can't. And, any leader who profanes otherwise is, as you said, a traitor to his people, often working toward his own monetary interests, to the detriment of the people he rules, a people he obviously hates, whether it be expressly stated or not.