A leader is someone who sees through issues, people and knowledges of the world completely, or more so than other people around him, or the people he could find.
He does not need to be someone who is "good", possessing a "good will" towards others.
He just needs to be someone capable of getting into a position of a leader.
Now, philosophers, or students of philosophy , will ask, where is the perfect leader?
We ask this because we see that these leaders often rule, more so, than other leaders who are more "good" than them, mostly for their own benefits.
We can se