12-34, the officers involved were simply reacting understandably (not the best way, but acceptably) in your mind to a man with a gun, yes?
You say this is because, "no matter your appearance or demeanor, a police officer cannot know what is going on in your mind."
Fair enough.
So would it be acceptable (again, not the best way of doing things, but understandable) for a police officer to lunge at the gun of another police officer he doesn't know? I mean, just because the other guy has a badge doesn't mean he doesn't intend to kill the officer or whoever. Maybe it is understandable, looking at it from both sides, that Officer A should feel the need to perform a gun-grab on Officer B while he's relaxing with a book. He doesn't know what's in the other person's head, after all.
I live in a state where both concealed and open carry are illegal. A couple of nights ago a co-worker was selling a computer to a police officer, who was carrying a SIG P229 on his belt with an extra magazine on the other side. I say he was a police officer because he had a badge on his belt, but maybe he wasn't, now that I think of it. Or maybe he was one of those evil Rogue JBTs you hear so much about in some quarters. Maybe he was just waiting for the chance to kill everyone in a blue shirt (at Best Buy.)
And yet, somehow, it never occurred to me to make a grab for his gun to keep everyone safe. I was completely beguiled and taken in by the fact that he didn't behave like a threat in any way.
Then again, maybe the missing element was some hysterical complaint. Maybe if some blissninny had whispered fearfully "that man has a gun!" I could have worked up some enthusiasm for getting cut, shot and arrested. As it was, I admired his SIG for a moment, then moved on.
Come to think of it, he noticed me looking at the SIG (I was slightly behind him, but only because that was where I was working) and put his right hand casually on his belt right behind it. Heroically, he did restrain himself from grabbing me and physically restraining me to save himself. I'm glad he did, but I'm a little surprised. After all, he couldn't know what was in my mind.