Of the complaints about the police officer, Derek Chauvin, some of those included previous killings. He had killed before. He was as much a criminal as George Floyd.
The UK protests are about UK racism. They are part of an international movement about racism. The UK suffers from institutional racism just as much as the US. We're lucky our police don't carry guns, because if they did, there would be a lot more BAME deaths at the hands of the police.
If we look back in history, no protest movement is ever approved of by the establishment. If you are white, you will not have suffered the problems of those who are black.
For the person who said 'I don't care what colour you are, if the police tell you to get out of your car, you should get out.' The difference is, if you're white, you get out, get your details checked and then go on your way. If you're black 1) You will have experienced stop and search regularly and 2) You have a very high chance of ending up hurt or dead.
I really hope the Black Lives Matter movement is as strong and continues in the way the Civil Rights Movement did in the 1960s and achieves real change.