@serenesurface-- It's true that natural resources are very important. For many countries in the world, most of their GDP comes from natural resources and the products they produce from them.
I think the issue that you are referring to when it comes to OPEC is that we have states in the world and these states own the natural resources on their land. Organization of the Petroleum Exporting Countries' member states are all countries with petroleum. So it's not like they're taking others' natural resources. They are merely keeping petrol prices stable by deciding how much to put out into the international market.