I think you have that reversed. American silence on Bahrain is not because they have no oil left, but because they are next to Qatar and Saudi Arabia and Abu Dhabi that have lots of oil. Oil, btw, is a fungible commodity and it does not matter in the least where it actually physically goes. Also, at the moment that the Col. took over, Libya was pumping more oil than Saudi Arabia and production has massively declined pretty much every year he's been in power. It got to be enough of a crisis that he let the US oil companies back in a few years ago to try to increase production. Given Libya's reserves and population they should be Kuwait in terms of living standards. Even as democracies consistently provide the highest living standards, an oppressive authoritarian regimes like Kuwait still provides living standards 4 times those of Libya's current totalitarian regime, starting with similar material. Any alternative regime, even with only minor decreases in aggregate insanity, should be able to generate considerable improvements in social well-being.
As for the Ivory Coast, what is going on now has been building for quite awhile and the Bush Administration did VERY much intervene at the beginning. That was the moment that Charles Taylor was removed from Liberia. His intervention in the Ivory Coast was the last straw that got the US to engineer his removal, and he played a significant role in magnifying the North vs. South conflict in the Ivory Coast. Plus the Ivory Coast has all of the world's chocolate and is in fact quite vital to the global corporate supply chain of advanced capitalism. Also, the US has to consult Nigeria, at the very least, before doing anything policy-wise in the direction of the Ivory Coast. It is my understanding that the former president of Nigeria has been to Abidjan multiple times in the last few months trying to negotiate a graceful exit for the current regime. If and when the US moves in West Africa, it will probably be in the person of Nigeria as a proxy.