Studies show that we, as a race, have become less violent over the centuries. Citizens of developed countries tend to hold a belief to the contrary due to increased media coverage and exposure of violence. Needless to say, we're doing something right, but what is it? Cultural or emotional evolution? Increased life span, leading to an increased value of life? Leave your theories and thoughts in the comments.
Link to the article: http://aboutfaceintl.org/2009/07/25/why-is-there-peace/