For many Nigerians, and some of my African friends/colleagues with whom I've discussed it, the 'Black Lives Matter' movement is something that they can sympathize with, but don't feel that deeply. For many more, who are insulated and haven't experienced life outside their neighborhood/town/country, it's just another "oh, that happened? Wow!" story. That's my experience.
I don't say this to say we don't care or we don't see the injustices and feel sad and helpless when we hear the stories, or see them debated/discussed on social media or on the news; I say this to say that (to paraphrase a saying I've heard in many forms) it's the person whose shoe the stone is in that feels the pain most acutely. Some of us just cannot relate.