Dave Grossman is a former Army Ranger officer, expert trainer and best-selling author. His book, On Killing and On Combat were essential pieces of literature for me prior to heading to Afghanistan. 

He contends that our society is very sick and are fed a constant feed of violence and murder that creates social instability and chaos. 

You can find him at www.killology.com

Get a copy of my book, The Nimble Warrior, here