The best analysis I’ve seen yet on why “Black Lives Matter” makes some people so uncomfortable.

“Some white people might say that singling out Black people’s lives as mattering somehow means that white lives don’t matter.  Of course, that’s silly.  If you went to a Breast Cancer Awareness event, you wouldn’t think that they were saying that other types of cancer don’t matter.  And you’d be shocked if someone showed up with a sign saying “Colon Cancer Matters” or chanting “All Cancer Patients Matter.”  So clearly, something else is prompting people to say “All Lives Matter” in response to “Black Lives Matter.”

The Real Reason White People Say ‘All Lives Matter’ | Huffington Post