Fleeing felon rule
It used to be if someone ran away from an officer, since only the truly depraved would reject civil authority in such a manner, they must be a fleeing dangerous felon, best shot as one would a rabid dog.
But since we no longer maintain the fiction of law enforcement being sterling principles of the law and order... We generally don't trust their say so with capital punishment.
I credit both the move of political power to more diverse and less isolated segments of society and the increase of ease for information transfer.
Like many changes in society, its worth remembering those old folks in the greatest positions of power remember how things used to be and are generally unimpressed with the cries for justice raised over what is frankly a huge improvement over what they started with.