So, if it is in our national interests - and if the country's government is a dictator - we have a practical reason and moral justification to use military force.
So there.
Now they just have to cross that final hurdle about getting Congress to declare war. Its astonishing that one man can decide what our national interests are, pick a side, and start wars based on that opinion.
We care more about U.N. approval than we do of our own Congress.