You'll probably find this interesting then. It's about how violence rates have changed over time, and some guesses about causation. http://www.amazon.com/The-B

You'll probably find this interesting then. It's about how violence rates have changed over time, and some guesses about causation. http://www.amazon.com/The-Better-Angels-Nature-ebook/dp/B0052REUW0/ref=sr_1_2?ie=UTF8&qid=1353437806&sr=8-2&keywords=better+angels+of+our+nature http://www.amazon.com/The-Better-Angels-Nature-ebook/dp/B005...