Well, the least to say: its a very complex matter i think. Its tough to make a generalized conclusion. You can find examples for the good and the bad. Developed nations have different interests and motives. On one side, moral awareness to aid other and developing nations, but also parties protecting their own interests. We also see the influence of consumers in organizations like Fair trade, with different effectivity. Regarding vital resources like fossil fuels, big money often wins but exceptions are possible. The public opinion always matters but can be a bit erratic. Still, the demand for fair clothes, chocolat and soccer shoes are notable as example. I can go on and on about some matters, but in general you can say: the assumption in your question cannot be affirmed. Global policies are very diverse and too mixed in effects. The interest of developed nations are not free from selfish acts, but can be positive as well.