It's because everything they believe they have as a culture was literally make of the backs and blood of all oppressed people's from colonial nations.
You take that away what do you have? A bunch of statues of a decaying past were whites had the power and treated everyone else who wasn't like them as subhuman.
Enjoy as they are removed one by one.
If you want to match these 'great' achievements, you'll have do it again off your own backs, with your own children.
To the people who asked what to do about the buildings that slavers funded, they belong to the slaves that built them and funded them with their lifeblood. Maybe, start there.
Given all the cross over between womens' right and bame rights, it's a shame it attracts racists.
But then that's the middle class demographic. Too wealthy to empathise, not wealthy enough to benefit. Except by indulging in 'wow look what we built'
You built nothing, won nothing, found nothing and discovered nothing without extensive help from other black/brown humans and colonial nations.
I know it's hard to accept and it's scary, but you'll do okay.