I agree situational awareness is extremely important and I am always looking out for trouble. As a LE professional I deal with criminals on a daily basis and some of them have threatened me. But SA isn't a cure-all. As for the reduced risk of not having a round chambered, I don't know what you're talking about. As long as your pistol is in its holster, there is no chance of a round being discharged. If you pull your pistol from its holster, it means you're in trouble and it needs to be ready immediately. You don't need to be in a risky area to at risk.
I don't know what military you were associated with, but with the M-9 the standard carry was round chambered and weapon decocked with the safety off. That was even during training exercises.
“I don’t know what military you were associated with,”
Air Force, M60 and M16