And if the LEO's had shot him (and especially if shot in the back), there would be people crying out that he was shot unfairly for "just walking down the street!" He was on his way to target practice carrying his rifle, after donating blood and a kidney, and tutoring the homeless, and was just shot for NO REASON. Activists would start rioting and burning the city down. The dead perp would be a hero and martyr for some kind of "I'm unemployed, bored with life, and mad about everything" cause. The President would make remarks about his death, and send dignitaries to his funeral.
Very much doubt you could find any posts to back this scenario up, given the circumstances. Jmo.
Or, if they shoot the guy in the back from the safe distance and protection of their squad car, they have a dead perp, the bullet/s were cheap, and we don't have to try, convict, and house this criminal in the state pen for the next 30+ years. The squad car isn't demolished, and no property damage. No hospital bill for the perp, either. Is that how police should have handled this?? Just roll down the window and shoot? I don't think that's the right answer, either.