Well said, as usual.
I long ago stopped "whitesplaining"....explaining white people to white people. They know damn well what they've done to this world, to us particularly, but like to pretend that it's only coincidental or accidental or "fate" that somehow they just seem to have and horde the lion's share of all the good stuff this world has to offer, while the rest of us must settle for their crumbs and leftovers because we just don''t and didn't "work hard" enough.
As you put it, it really is a waste of time and energy trying to convince people of a truth that they are determined to deny no matter what. It’s just not in their self-interest to honestly face their sordid and blood-soaked history of rape, robbery, slavery, theft of whole continents, and genocide.