Here’s one answer to people who respond to Black Lives Matter with the inane “All Lives Matter”:
Given America’s history, there is no reason to believe that when white people say “All lives” or “All people” in terms of rights or justice or privilege, such expressions include black people (or POC or Native Americans). When the founding fathers wrote “All men are created equal” in the Declaration of Independence, we know that did not include black people–or obviously women. And when white women did get to vote, that did not include black women or black men. Similarly, given the state of our justice system and its myriad practices of racial bias, America does not truly want equal rights and justice for black people; otherwise we would have equal rights and justice for black people. “All Americans” should have the right to a fair trial, but that is not the case in the current justice system (nor was it the case when my parents–who were citizens–and my grandparents–who were forbidden by racist laws from becoming citizens–were imprisoned for their race and ethnicity in World War II). Unarmed black Americans are twice as likely to be shot by police than unarmed white Americans. If all lives did matter, this would not be the case.
So when white people say “all,” is it any wonder we think: “You mean just yourselves, not us.” As the old black saying goes, We don’t believe what you say because we see what you do.