The developed world (mainly western) has inflicted some atrocities on the other parts but that is not what you trying to picture here. There were countless examples of even the tauted-to-be-benevolent tribal people (e.g. African) attacking and trying to wipe out other tribes throughout the world history.
Alas, currently it has become fashionable to put the entire blame on developed western world. This is propaganda (the one that Marxists and communists also love to spread).
I am not a westerner but I do acknowledge many great deeds done by the westerners in the other parts of the world. Internet, electricity, railways, trucks, roads, aeroplanes, mobile-phones, project Gutenberg, concrete, internet archive, Wikipedia, better agriculture practices, agro machines: take your pick. Also add to that the recent initiatives like MIT OCW.
These things which the western world has given to the entire world there is no parallel such benevolent behaviour in the human history. I am grateful to the developed world for such acts of courage and rising above one's own good and one's own religious sentiments.
I am an Asian, and I do know how mean and malevolent our own people had been and have been even now. Countless massacres and oppressive practices by the Islamists and communists and other tribes and groups.
Personally for me, the projects like Internet, internet archive, Wikipedia and OCW have been so beneficial that I cannot imagine myself educating me without them at such a low cost.
BTW, evolution is a complex phenomena but social structures are also important in overall progress of the society. The western developed societal structure is the best societal structure as of yet.
W.r.t. this it is no wonder, for many people here (including me), the western world seems like heaven.
Why in the world would you think that? We're still made of genes aren't we? We still sexually reproduce don't we?
because of actions we (developed world) have taken
Stark differences existed between the continents long before colonisation. Stark differences exist in areas that were never colonised.
Some areas that were colonised are now thriving.
As much as we like to flatter ourselves, we are not the cause of all the world's problems.
Nor is the constant haranguing of people who have nothing to do with events decades and centuries past of benefit to anybody.
Let's consider biology. Physics and chemistry constrain biological processes and systems, for sure. But the number of distinct proteins based on the same set of amino acids, for example, is arguably unlimited (or at least, huge). Selection may favor one protein over another, and yet have virtually no impact on amino acid structure and diversity. Let alone on atoms, nucleons, quarks, etc.
The same applies to societies and cultures vs peoples.
Physics is just emergent properties of ... (math?). Chemistry is just emergent properties of physics. Biology is just emergent properties of chemistry.
It's turtles, all the way.
The question you should be asking is how we can accept that so many people are unable to save themselves because of actions we (developed world) have taken. Both recently and in the past.