I think that where your argument falls down, Al, is that this was no spur-of-the-moment killing, no panicky misjudgement. That would have been bad enough in a trained police officer, but this guy spent nine whole minutes on Floyd's neck before deciding to back off. It must have been pretty clear to him that his victim had been made safe after just a minute or two. In fact, the longer he persisted, the greater the risk that someone in the crowd would react violently and adversely. Making an arrest knowing that a lot of people could have been armed must be scary, as you say. But your man didn't exactly make it snappy, did he?