http://www.amazon.com/On-Killing-Psychological-Learning-Society/dp/0316330116
According to the author of this well researched book, the police were not trying to or able to kill. Instead they were engaging in “display” behavior. Much like a cat who hisses and puffs up, its about seeming dangerous without actually committing the act. This is what gets cops and psychologically unprepared CCW carriers killed. This book is a must-read if you carry.
Dave Grossman is a charlatan, much like one of his principal sources, SLA Marshall:
http://www.theppsc.org/Grossman/Main-R.htm