There's a number of things going on: this zero tolerance policy of guns, no one is taking a moment to see if it's an actual gun, a toy, a cell phone or a hair dryer. And no one is stepping back to assess the situation - is this a child with a toy, did this person hear/understand what was said, could we have defused the situation differently? Everyone just jumps to conclusions without thinking. Remember we now live in a day when a five year old child gets suspended for crayon drawing of a gun at an art class, wearing an NRA shirt (or U.S. flag shirt), or kissing another child innocently. People are so quick to spring into action that no one uses their head - or basic common sense anymore.
And the fact that no one is stepping back to assess the situation or thinking is the problem. And to think that the people we have hired to supposedly protect us not doing those things is the scary part. I have known quiet a few cops in my lifetime and the one glaring fault that most had, was a lack of common sense, I used to tell some of them the reason they got the job was they checked NO on the application next to the question asking if they had common sense. Other faults they seemed to have: they seemed to like the power that came with the job, lied in court on a regular basis, stuck up for bad cops and seemed to enjoy the ability to hurt people and get away with it.
Right now we seem to have police that shoot first and ask questions later and unless we find a way to hold them accountable for their actions it will only get worse.