I think the whole point that RED was making is that joe citizen could quite possibly face the very same criminal that the police feel a AR15 is needed to defend against. Sure, there is a whole lot greater risk when someone faces criminals for a living but the point is still valid. Most people feel a strong obligation to defend themselves which was the singular point.
"I believe that the right of the citizen to keep and bear arms must not be infringed if liberty in America is to survive." - Ronald Reagan