In this case, to be completely cynical/pragmatic, there is not even oil at stake, so even if we accept the purely mercenary motivation of our fossil fuel addiction there is STILL no reason to get involved.

I am OK with humanitarian missions to end crimes against humanity—but not unilateral ones. If the international community forms a consensus and COMMITTMENT to end genocide or carpet bombing whole towns of noncombatants I support joining a COALITION. But no more of the rest of the world expecting the US to pay the price in dollars and blood to clean up their messes, condemning us when we do not leap to do it fast enough, then bitching about HOW we did it. Any problem insufficient to justify EVERYONES involvement (and culpability for any unintended consequencdes) is insufficent to justify ours. We no longer have the resources to police the world, and never had the obligation.