The dispute seems stupid though if you ask yourself why black lives matter. Black lives matter because all lives matter, and yes there is no doubt that our history way beyond slavery has failed to recognize that.
You and I and everything else in our world are like this web page. We are made of tiny particles that dance and degrade and even hop out of us into the air and water and other things around us.
Buddhism says we are disappointed by the world because of faulty expectations. It is faulty to think that babies will never cry and dogs will never bark and brakes will never screech, so why let those things throw us off? The Buddha is even in hateful thoughts and violent crime.