anyway, my "problem" is that you accord the USA the right to use force all over the planet because the federal gov't might think somebody is dangerous. meanwhile if other countries were using force against the USA in such a manner, bombs dropping and civilians dying by the thousands every year, you'd be more than livid, you'd be terrorized (and perhaps radicalized).
It's not a matter of thinking someone is dangerous my dear boy. It's the reality of the actual world.
http://en.wikipedia.org/wiki/Jus_ad_bellum
If the US wants to go to war in Yemen it should issue a formal declaration of war instead of just killing people on a sovereign nations territory. Not even recognizing that you are violating their sovereignty and just treating it as if the US government has jurisdiction all over the world is the height of arrogance.
The bottom line is that US actions in Yemen are based on the "because we can" principle. Nothing else. Great powers have always done that, but at least you should be honest about it instead of hiding behind a bogus interpretation of international law.