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.