To me the problem is there was not a reasonable way to arrest him and bring him to trial. If he presented himself to authorities in the United States, I have no doubt he would have received a trial. He chose to hide on foreign soil, in what I would consider a battlefield, and actively plot and participate in operations. That decision was an active forfeiture of his rights to a trial or other due process. It is a tricky way to go about things, but we need to adjust out laws and mindset to the threats that are out there. Like someone else said, this wasn't a snap decision to kill joe blow citizen while he was out at starbucks, this was carefully vetted by both political and military leaders from all stripes and in that context, I support similar operations in the future.