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What a freakin' windbag taking the long way around -- OBL was an enemy commander of an active army who declared war on the US, who confessed (bragged) about bombing two US embassies and the World Trade Center -- of course it's legal to kill him anywhere you find him.
The propaganda value to the enemy of a live OBL on trial was worth more than any information which could be extracted from him. Death was the patriotic and humanitarian course -- it ultimately will lead to less follow-on deaths by the enemy who even today is striking US agents worldwide in retaliation. The quicker the better that we get this over with. Killing OBL was the quickest path to peace with the fewest casualties.