Our society has decided to hire mercenaries to protect the law-abiding from the criminal element.
These same mercenaries are expected to be on the lookout for criminals, confront, and engage with them in mortal combat if so required.
In order for our mercenaries to proceed with their task to the best of their ability, and also take every reasonable precaution to ensure their own safety standard operating procedures have been developed that have been proven to be effective, but have the negative side-effect of producing near robotic responses to threats, or even potential threats. Unfortunately the general law-abiding-public is not easily differentiated from the criminal by this robotic methodology used by most modern law enforcement agencies.
I strongly suspect that the Aurora police officer that held the 12 gauge to the throat of the visibly unarmed teenager has a certain amount of disgust with that picture himself. This is what happens when human beings allow themselves to become robots. Perhaps it is time to re-evaluate this methodology - as well as some of the other attitudes regarding videotaping of LEO's in public. Our society is becoming a war zone.
I honestly am trying to give law enforcement every possibly break on this one, but this insanity must stop. What if the bank robbers had been a modern day "Bonnie & Clyde" duo ? There would have been blood running into Denver from the gutters of Aurora.