Some of the richest countries in the world are filled with desperately poor people.
Having oil, copper, gold and other valuable resources does not translate into healthy economies.
Why not?
Simple: The wealth that is generated by these resources is stolen by a handful of local elites who cooperate with foreign looters.
The offshore banking system facilitates this theft and if the local complain - or have the temerity to keep the profits for themselves (think Iraq, Libya, Venezuela etc.), they are dealt with by other means.