What makes you think that they had "a clean shot at the perp"?
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Irrelevant to what you claimed.
You claimed "good guys with a gun" would not attempt to stop a slaughter for fear they might be charged with a crime.
Clean shot or not wasn't part of your formulation.
My formulation is that if a clean shot was available to the "good guy with a gun" fear of legal consequences should hopefully take a backseat to stopping a schoolhouse slaughter.