Euro-Marxists in the late 1960s fundamentally influenced this worldview, where the only colonial and imperial powers were from the West, rapacious in their territorial greed and mindless in their racial atrocities.
Imperial colonialism is also not relegated to simply the West, as some of the largest imperial and colonial powers were the Persians and the Ottoman Turks.
Had it not been so, volumes of work would be dedicated to chronicling the rise of a new imperial and colonial power from the East.
A lot of good things come out of colonial powers.
Nature abhors a vacuum, and colonial powers have just been historically great powers strong enough to take advantage.