It's time U.S. police do see a lesson in Floyd reaction

Beginning early in the 17th Century, blacks on the continent of Africa were kidnapped and loaded onto ships in chains to be brought to America to serve as slaves to the white man.
They supposedly won their freedom in 1865 when the civil war, in which slavery was one of the major issues, came to an end.
But somehow or other it seems that more than two centuries later this freedom is still not accepted by all Americans.
How else can you explain the seemingly unrestrained killing of black men by wh