There is a nice scene in the film Before Sunset where the two main characters are discussing the fact that the female lead, Celine, is working for an NGO. Speaking about what she sees around her:

I see it in the people that do the real work, and what's sad in a way is that the people that are the most giving, hardworking, and capable of making this world better, usually don't have the ego and ambition to be a leader.