I'm often quite sympathetic to cops who end up shooting suspects who turn out to not be a threat. Not regularly being in the business of facing down armed criminals I'm not going to substitute my judgment for theirs about when they perceive a threat in any given situation. That isn't to say there aren't trigger happy cops or situations where they've gone too far, but I'm certainly one to give them the benefit of the doubt.
However understanding that occasionally a bad shooting is going to happen is something entirely different from endorsing as a matter of constitutional principle that cops have the right to shoot any fleeing suspect.
Alito. What a fucking piece of work.