The Second Feature of Political Realism

I am adding one more feature of political realism on my blog.

Hans Morgenthau describes political realism as the theory which knows moral principle. Hewe I found the correlation Thomas Hobbes' human nature and the idea Hans Morgenthau analyse. When I studied Thomas Hobbes, I found that he believes that human nature is self-centered and emotional, although that he believes that human beings has reason.
By the way, Hans Morgenthau shows us that political realism knows the importance of moral principle of political action. However he asserts that moral principles of political action cannot be applied to the international politics.

I suppose that the reason is every state has to survive in the world, and surviving in the conflictual world is the immediate goal for every state as Hans Morgenthau explain.