Libya was just the opener. Libya was the center of an attempt to form an African Union with it's own currency and lending institutions that would have liberated the continent from the IMF and returned control of Africa's resources to African nations. The British fought to control Africa, and the French, and the Germans and now the Chinese and the US are facing over that continent.
Sometimes, when the other guys get all the contracts the option left is to go in, bust up the government that made those contracts and then start over. That's how it goes. The US has been replacing governments for economic gain for at least a century - sometimes quietly, sometimes not. They aren't the only ones who do that, but they do use military means more often than other countries because they have more military.
Busy. Have you noticed the mess that piled up at home while the elites have been playing empire overseas (on your dime).