Does leadership improve societies?

Without a doubt, a selfless, motivational and good leader can have a crucial role for the improvement of a society. His/hers example may start a process of transformaion of the way of thinking, the attitude towards particular subject or even the policies of a country. In times when endless sources of information are available, it is more and more important for the people to have real individuals who to follow.
However, being an example comes with a lot of responsibilities since leaders are supposed not only to be the forerunner but also to estimate how his actions reflect the society. Simply said - the good model of behaviour provokes improvement and even better behaviour.