My theory? My understanding is that this occurred when the guy was asleep. He is awakened by someone trying to break the door in. I don't believe that this guy even knew that they were cops- witness the fact that he stops firing and disconnects from the weapon as soon as it becomes obvious that they're cops.
Besides- if he had known that they were cops, what sense would it make to shoot at them if he doesn't have drugs or other contraband in the house? He'd just be setting himself up to be screwed.
Think the founding fathers of this country did not appreciate the obstacles they were attempting to establish against the tyranny that so many here are willing to accept?
Each citizen is equal to a cop, a judge, a senator, the president, etc., cops do not have any right to break into a person's home, suspect or not, unless having presented a legal warrent to the suspect, he resists. Suspects are innocent until found guilty in a court of law in accordance with legal process.
How many cops get capital murder charges when they mistakenly kill someone they misapprehend as a threat? 0.