I don't like your tone: I can't tell if you are a troll or being humorous? You get an average of two seconds to IFF in a gun fight, there is no reason why you cannot carry an AR chambered with the safety on. We did it that way in the military, in vehicles no less. It's just as daft as carrying a pistol or revolver with no cartridges in the chamber/cyl while on duty. No reason to not chamber a round whatsoever on duty. A good deal of gun fights exist on video and fumbling to chamber a round has probably killed many a soul. And speaking form experience, everything is harder when you believe your life is in peril. You truly fall back on your training.
Respectfully, your perception of my comment is as flawed as your logic pertaining to LEOs and patrol rifles. Read Perez's comment above, and Motor51's last input above. LA26 has also provided some really solid input on this topic in the thread, he is a LE Instructor.