This is an interesting lecture. One that flies in the face of current JW and I assume most non JW thinking. Evidence shows that when examining history mankind was more violent over the centuries than they were during the 20th and 21st Century. Pinker argues that we are just more savvy now when it comes to reporting, the idea that we live in a more violent society today is a myth and not supported by evidence.
http://www.ted.com/talks/steven_pinker_on_the_myth_of_violence