> In the talk he makes a note that the book does not try to explain why... Ummm, the book was published only in 2011. The TED talk is from 2007. Even without

> In the talk he makes a note that the book does not try to explain why... Ummm, the book was published only in 2011. The TED talk is from 2007. Even without seeing the TED talk, one can claim that your observations don't add up. I looked for the dates because in my reading of The Better Angels of Our Nature, there seems to be plenty and more answering the question of 'why' violence has declined.