...Obama and his predecessor Bush never sought the kind of justice that would have seen bin Laden tried in an international court. As early as his election campaign in 2008, Obama swore he would "kill bin Laden" and finish the job begun by his predecessor after 9/11. "We went to war against al-Qaida to protect our citizens, our friends and our allies," the president explained on Sunday night. A US national security official didn't beat around the bush, telling Reuters, "This was a kill operation." And why shouldn't it be? The very goal of war is the defeat of the opponent, the killing of enemies through legal means. War is war.
In truth, it isn't quite that simple. And not everything that the United States declares to be war really is. Legal experts like Kress say it is "questionable whether the USA can still claim to be engaged in an armed conflict with al-Qaida."
It was certainly still war when Bush began the invasion of Afghanistan in 2001. Operation Enduring Freedom targeted the Taliban government in Kabul as well as Osama bin Laden's terrorist organization which it backed. At the time, al-Qaida maintained bases and training camps in Afghanistan -- just like a warring party, in fact. The war on terror was understood to be an "asymmetrical war," and the laws of war also permit the targeted killing of non-state combatants, provided they are really combatants who are organized in units with a military-like character, and that they are integrated into those units either as armed fighters or as a leader who issues commands.
Was Bin Laden Still Even Giving Orders?
For years, Osama bin Laden was, without a doubt, a combatant according to the latter definition. Many terror experts today, however, doubt that definition still applied to him in the end. "Al-Qaida has obviously had a network structure for some time. In a network, it isn't clear who gives the orders in individual instances," Kress says. "Outsiders also know very little about al-Qaida's structures in the Pakistani border areas. It is in no way certain that bin Laden still had the authority to issue commands as head of a quasi-military organization."
But if bin Laden was no longer a leader, it would no longer be permissible to treat him as an enemy combatant or kill him.
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http://www.spiegel.de/international/world/0,1518,760358,00.html