Any sources for the disproportionate claims?
Yes, black people have been killed by police in this country, but that isn't what these protests are about because it isn't an issue here. I've linked the police deaths so you can look through and pick out ones that were unlawful, you'll note that the worst cases were decades back (and not all related to race).
https://en.wikipedia.org/wiki/List_o...United_Kingdom
Trying to conflate US police issues with our issues is insulting and undermines the movement in the US.