Let me clue you in on something.
You're at a checkpoint. There's a guy in the crowd who is clearly got something bad planned. You can do nothing, because he is "not a threat."
The guy whips out a gun and sprays the checkpoint. Several of your guys get injured. You can do nothing, because he is in a crowd of innocents. He runs into a building and drops the gun. He then walks into the street. You can do nothing. Why? Because he is "not a threat" anymore.
Our rules of engagement are over-the-top in trying to protect against collateral damage. I'm no soldier myself, but I got to listen to three of them bemoaning about this situation - a corpsman, a SIGINT guy, and a guy who's position was unclear to me but was in charge of 20 infantry.
Yet you still have people like you, who think we mow down dozens of children at a time, just for giggles.