Maybe cops learned from the 60s that defending against a knife with a baton failed lethally often enough that shooting is preferred.
Is there ANY justification for a cop to shoot someone?
Should be the same exact justification afforded to citizens.
Right now, the rules governing use of deadly force for a citizen are extremely limited.
Emptying an entire magazine from two weapons into a someone we felt 'threatend by' would be an anal examination by the same agency that absolves what their agents are permitted to do to citizens.