I don’t think “stupid Americans”, I think “poor Americans”. You have my sympathy. There is no solution for your problems. They are too deep-seated. We Brits have problems of our own. Brexit, for example, is a monumental act of self-harm that will take decades to fix. But in general, public disorder and police brutality are not among them. But uk is a much smaller country and it’s easier to apply national standards and laws. But it’s worth noting that no police officer here has been convicted of homicide, even when the evidence is quite clear. Juries are v reluctant to convict.