It's not enabling those who endorse the shooting of INNOCENT people.
NOBODY ENDORSES shooting innocent people. The fact that three innocent people were shot, and six innocent people were struck by flying debris/fragments is unfortunate, just short of tragedy.
Letting a killer continue to kill (again, which they had NO reason at the time to believe was not his plan) is MORE of a tragedy.
Terrible risks caused by terrible actions of a deranged person.
The officers HAD to act.
The officers were the ones on the scene. Not some other officers, a pair of USPSA Grandmasters, or the Delta Seals.
The officers on the scene were possessed of a certain level of skill. Not perfect skill, only that which they'd been able to attain through their training to date.
They had to act, and had to act to the best of their ability. They could not turn away, they could not go "time out" and go get someone better. A proven killer had drawn his gun and was pointing it up the street, at them.
We're sitting in judgment of them and but can offer nothing beyond that they should have been better or they should have been luckier. Yes, they SHOULD have been! But they did what they could with what they had. And the killer was stopped and no one else died. We can be thankful of that.