>>17823674
>european colonial powers terrorize the brown world for centuries
>brown world starts immigrating to their lands
>this is seen as an atrocity the likes of which have never been seen before

They key difference is that one made places better, while the other one is making places worse.
It's not about legitimacy or morals, it's about the end result.

>>17801420
Abolition of slavery, cannibalism, human sacrifices and tribal warfare.
Introduction of medicine and modern technology, resulting in massive drops in child mortality rates.
Introduction to proper cities and clothes.
Introduction of basic education (even if not universally available), end of the utter isolation of Subsaharan Africa from the rest of mankind.