Please be a troll. I know people all over the world still have thoughts like this, but I thought people on hacker news are smarter than that.
#1: Things weren't "better" in colonial times anymore than they were better in Apartheid-era South Africa or Jim Crow-era America. Hell, we can even go back to Slavery-era America. Sure, things were more peaceful and ordered. At the expense of the subjugation of a significant percentage of the population.
You can absolutely attain peace and prosperity at the expense of the freedom of your citizens. We call that Fascism.
#2: Most of the problems that occur in post-colonial hot-spots are not there because the European colonial administrations left. They are there because THEY WERE THERE IN THE FIRST place.
The Europeans:
* Deliberately destablized peaceful areas so that they would be the one to introduce order
* Divided and conquered previously peaceful tribes by boosting support for one in order to attain power (see: Rwanda)
* Toppled democratically elected governments because of fear of communistic populistic ideas that threatened wealthy western industrialists
* Created borders abstractly - merging peoples that did not want to be together and dividing those that did.
Western countries would not be this far ahead of the rest of the world without decades if not centuries of exploitation. And maybe, just maybe, if progress happened at a more natural rate we would have been able to learn some more sustainable practices. Maybe we wouldn't have the internet or smart phones for another century, but maybe we wouldn't have been responsible for The Sixth Extinction.