TED talk about compassion and Buddhism and peace by Tenzin Bob Thurman from 2006 (posted 2007).
He contends that we should be compassionate because it is more fun. When does suffering begin and the good times end? When we ask, “How much fun am I having? When will it end?” Our suffering ends when we stop thinking about how we are feeling and focus our thoughts and energies on making the lives of our fellow creatures (even one) better (even just a little bit).