In your answers you said: "if the leaders or rulers would have treated their land with fairness, then their rule would have lasted for long time". Are you talking about the four rightly guided Caliphs? What we have seen in history is that these four rightly guided Caliphes had set such a wonderful example that even the Westerns are forced to admit their administrative qualities and achievments. You know about Hazrat Umar (ra)'s administrative qualities and achievements. Yes nobody is perfect. Can you please provide me with some references from the history to show how Hazrat Umar (ra) actually treated non-Muslims under his rule or leadership?