If the sources are non-white, the level of enthusiasm is not there.
Outside of the Western world, we have Black African Christians being butchered by co-racial Islamist militants in the Sahel.
Little is said.
Black African students and workers have been subjected to horrendous forms of racial discrimination in China.
These are very clear and well-known cases. These lives matter as well no?
But if you express solidarity with "counterparts" in the US and protest over issues there, then people will ask why there is a lack of focus on cases of black people suffering in other parts of the world.