It does not happen because their societies are corrupt. People succeed because of who they know or are related to, not on the basis of their individual merits. Their personal and property rights are not respected. They often have little and what they do can be taken away from them at any moment in time. It is a struggle to survive.
Life is often short, brutish and extremely unpleasant.
A state that is the same as it has been for most of humanity since time immemorial. The difference is that a section, the developed world, has gained a sufficient level of affluence that most of their citizens do not suffer in the way that their forefathers did. Make no mistake. This is not necessarily because of any inherent superiority of us over our forefathers or other people on the planet. Our genes have not changed that much, and the difference between races is minute.