In 2005 the UN adopted a new policy, with an obligation to protect.
It basically states that a country has an obligation to protect and care for its citizens. If a country fails at protecting them or even attacks its own people, like Saddam did in Halabja -88, then it falls on the UN and its Security Council to step in and protect innocent civilians.
Gaddafi has now shown beyound all reasonable doubt that he cares more about his own power than his people. This then invokes the above mention UN resolution from 2005 and the obligation to protect now falls on the Security Council and the individual UN member countries. So now those countries which can afford and have the ability to help now has an obligation under a UN resolution and wolrd morality to do so.
Since the UN does not have its own standing army, it mainly relies on NATO to step in and help out with strategy and military resources. Since the biggest and baddest NATO member is the US, it's rather common that America takes charge and heeds the command. The annual US military expenses alone makes up more than half of the total military spending in the world. With all that in mind, it's very natural for the US and its commander in chief, the leader of the free world to step up to the plate.
Anyone who thinks differently is opposing the idea of basic human rights and the primary idea of democracy.
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The truth is not affected by the beliefs, or doubts, of the majority.
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