Why do we need leaders? Joshua 16-20

Why do we need leaders?   In every society we can see those men who lead and those who follow.   But why is that so?   Perhaps in Joshua 18 we have a little insight into the answer to that question.    In Joshua 18:3 we read that Joshua had noticed that seven of the tribes had yet to start their ownership of the land.   They were apparently "just sitting around" and enjoying the camp fire where they were.  Joshua had provided the land boundaries to the sons of Joseph and had given land to the tribe of Judah.   Even though these tribes were given the land in front of them and were told to go out and possess the land, they were content and comfortable still living in tents and sitting around.   They lacked the "leadership" within themselves to go out and conquer.    Joshua has to step in to provide that leadership.   Left to our own man will not go out "conquer" on their own.   God has provided leadership to Lead man into the act of conquering.   The depravity of man is to be content.   Or, to pursue evil.   But, to pursue what is good and to follow God's command (God had commanded them to conquer the land) is simply not in man.   God ordains leadership to lead us into battle, to secure the reward.    Good leadership is about getting others to do things they wouldn't do on their own for the common good of all.   Left to their own imagination and energy man will not accomplish great things.  It is only through God ordained leadership that we see great things accomplished in man and by man for God.