There are 2 top reasons for failure in leadership as exampled in Napoleon Hill's Book titled "Think and Grow Rich." The first reason is an inability to organize details and the second reason is an unwillingness to render humble service.
When you are thinking about a leader you like to think about the positives of the leader, the things that make the leader great. However, as you get closer to the leader and start to actually "follow" the leader this is when the weaknesses come out. Every leader has a weakness because no person is perfect. By design we are imperfect.
However, what we are looking at today is not imperfection but rather reasons why there would be a failure in leadership.