Regardless, it's a pretty strong argument that the police in the U.S. should be immediately disarmed.
Sadly, I think the reality of the 2nd amendment has rendered that solution non-viable. Gun ownership in the U.K. is extremely rare. In the U.S., there are so many guns flooding towns and cities (about 17 times the rate of gun ownership in the U.K.) that officers have a reasonable basis for assuming that every suspect is armed. There are, after all, more guns in the U.S. than there are people. Unilaterally disarming the police in the U.S. would allow serious criminals to run rampant. It is a vicious, destructive arms race, and finding a solution will be an extraordinary long-term challenge.
What absolutely does have to change in the short term is police training and rules of engagement. Police need to be rigorously trained to de-escalate situations rather than escalate them, and to resort to deadly force only when all other options have been tried and exhausted. Right now, police say that their goal is for all officers to stay alive. That's a valid goal, but utterly insufficient. The goal needs to be for EVERYONE to stay alive, both officers and people they interact with.