That would create new "ISIS", commie revolutionaries would become a guerrilla force that would plunge country into civil war.

The operation of exploiting resources most likely wouldn't be endangered. They could even guard refineries with US military but the country itself would stay in same stagnation. Jungle and countryside areas controlled by paramilitaries. In environment like that a country can't prosper. What would be worse is that their resources would be robbed by foreigners.