I was just thinking about Keynes statement when asked about some long term concerns "In the long run, we're all dead."
What a cop out. If we consider that time and space are a continuum, a limited temporal perspective also translates to a limited spatial perspective.
This might help to explain why the policies in place in many industrialized countries have such disastrous consequences for places like Africa and Latin America. A national perspective is externalizing all negative consequences, or at least as many as possible.
The problem being, eventually these consequences come back in one way or another, and you realize that externalizing them was just a form of mental trickery or self deception.
I can give you a better reason for why stuff goes to shit in some portions of the world, but most people won't like the answer to why it happens.
Keep in mind 1940s and 1950s America was able to do fine with industrial policies in place and very little was being externalized, there was large production within their borders and they were able to avoid most of the negative consequences that are apparently a big issue elsewhere in the world.
Countries experience the negative consequences coming back at them when they start to care about those at the gates. Which is the mistake. Beyond that, they have a low likelihood of experiencing issues.
If the rest of the world was like the developed world (in more ways than one) it would be possible to avoid the negatives almost entirely. Lack of infrastructure (among other issues) causes certain places to do poorly.