It;s also worth noting that when the UK faced a similar problem with an undiverse militarized police force in northern Ireland they did this https://cain.ulster.ac.uk/issues/police/patten/recommend.htm and launched a bunch of investigation(the Stevens enquiries) into past crimes of the Royal Ulster Constabulary.
The problem in America blocking any meaningful solutions to genuine problems is the collective denial the American middle class have towards past sins and current systematic problems with the American way not that it's a new problem that have never been solved before.
https://www.telegraph.co.uk/news/2020/06/03/george-floyd-pro...
Either they are not perceived as well as you think or these protests aren't about what they claim to be about.
https://www.telegraph.co.uk/news/2020/06/03/george-floyd-pro...
Either the metropolitan police are not perceived as well as you think they are or these protests aren't about what they claim to be about.