You've obviously never heard the term "active shooter."
Things were different pre Colmumbine. Just as they were different pre 9/11.
Pre Col the cops were TRAINED to set up a perimeter and wait for negotiators just as pre 9/11 everyone was trained to let the highjackers have the plane and negotiate with them on the ground.
Now it is common for active shooters to execute as many hostages as possible as quickly as possible - so the first cops on the scene are TRAINED to move in immediatly. And passangers are now TRAINED not to be passive when being highjacked.
But the issue I have is that you are calling a cop who may have made a mistake and shot an innocent soul, grossly incompetent. Unless you can back up your charges, which I don't think you can, you should retract.
Course lots of people talk big on the net. You might be one of the people who'd say that to the cops face -doesn't mean you are right though.
Why don't you give the cop a break and retract. Let it be between the cop and the poor kid's families.
My brother is a retired LAPD officer who left on a medical after being shot in the line of duty a second time. I know what he thinks about Columbine, and base my appreciation of police tactics on his experience.