The killing of George Floyd could be among the worse cases of police brutality in the US during recent times. Due to the time it took for that to happen, it's especially inexcusable. According to the news, over 8 minutes. One would think the police officer would have known what was happening.
It would be easier to understand a misplaced shooting as those situations can unfold over a matter of seconds. Choices that have to be made quickly are often not the right choices, but somewhat understandable in dangerous situations where there isn't time to better figure out the situation.
Time makes a difference.