Holly crap, using your standards we had no right to kill Hitler unless he was holding a gun shooting at Americans. The asshole in Yemen was recruiting, planning attacks and providing material support to terrorist, just like Hitler did for his generals. He was directly linked to the Ft Hood shooter and others including the underwear bomber. Either you are ignorant of his activities or you are blinded by partisanship, either way you got this one wrong.
Those are my standards? Seriously?
We are talking about the government deliberately deciding to kill people that are American citizens who are not on a battlefield, not taking out the leader of the enemies forces in the middle of a war. If Obama has evidence that these people are actually engaged in active warfare then he should present it to someone. If, on the other hand, all he has is evidence that they were planning a criminal act, which is how he thinks the government should treat terrorism, then he should arrest them, and bring them to trial.
He cannot have it both ways. Neither can you.