HankB wrote:The guys's situational awareness was low - it could easily have been gang members, potential home invaders, or some other miscreants rather than the police who got the drop on him.
karder wrote:Whatever is out there is gonna have to come to me.

This attitude will keep you alive 99% of the time.
You're right that his situational awareness wasn't up to the situation he placed himself in, but I think it would be an oversimplification to say that he simply wasn't aware enough. While the details of exactly how the event played out haven't been published, there are a few things we can reasonably consider at this point.
It's important to understand that continuous 360 degree scanning for all potential threats, sounds, and movement in an adrenaline charged low light environment is a severe challenge for anyone. The citizen's ability to detect and process the amount of information he needed to survive would be easily overwhelmed by the amount of information presented (surprise, shouts and commands from unexpected officers) and the extremely short time frame he had to successfully make and implement decisions. The case is another tragic example of what happens when armchair commando tactics that sound great over a beer with one's buddies meet the unforgiving reality of the street where violent encounters are incredibly fast, brutal, and final.
A defender who remains inside his residence can take a known position of cover and limit the angles from which he can be approached. He can be certain that, if he knows where all family members are, anyone making a forcible entry and approach to his position is an intruder. With detection and identification questions out of the way, the intruder is then on the short end of the disadvantages described above in terms of detection, processing, and time. This gives the defender a much better chance of resolving the incident in favor of the good guys.
When things get dicey and lives are on the line, I'm a proponent of keeping every situational and tactical advantage I possibly can in my favor, and giving away nothing unnecessarily. There will always be enough challenges from surprises and unknowns without acting to stack the odds in favor of one's opponent.
I agree with both you and karder that, whenever possible, any aggressor should be forced to come to a prepared defender's position where things have the best chance of being sorted out in favor of the defender.