This unquestioned idea is the cause of the misery in those countries not the solution to the misery.
The very idea of economic policy is erroneous. Implicit in the term is the idea that whatever social relationships that exist and would exist in the absence of the colonial and post colonial influences would not and could not possibly be adequate. That the naturally developed economy or that that would emerge naturally in the absence of the corrupting influences of the colonizer can not be accepted as appropriate. That it must be changed. This is utter nonsense. Common sense tells us that societies can and do develop sustainable economies when left alone.
The idea that foreign experts and its corollary, foreign-trained indigenous experts, can somehow direct this misguided at best and disingenuous at worst, economic policy has been accepted at all levels and has caused untold suffering in the so-called poor countries. Instead of allowing natural social-economic relationships to be sustained and developed, foreign experts forcibly direct economic policy, which actually destroys the fragile social-economic ecosystem that is developing on its own.
The final blow comes from foreign money. Large sums of money created by governments and banking systems in the West with the single purpose of making a profit in the short run and gaining control of / owning resources in these so-called poor countries in the long run, are funneled into these countries.
People everywhere! Don't fall prey to these blood-sucking strategies wearing the 'respectable' clothing of economics and economic policy. The economists will destroy your countries and enslave you. Please let us wake up to this.