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And the ICC, is not currently an option.
Yes. But, were there an ICC, that may be most appropriate, because it would be multilateral and would enjoy the most international consensus, especially since so many countries signed the treaty. And the ICC provides an agreed-upon framework and set of rules for bringing the worst international criminals to justice, so it is tailor-made for this kind of crime. Even so, this is all somewhat hypothetical, not only because there is no ICC, but also because the states affected by the attack would have to all defer to the ICC, and that seems unlikely.
The ICC is a court with complementary jurisdiction; it was conceived to take action where national courts couldnt. Without too much detail, this means that legally, if the U.S. captures Osama bin Laden and wants to put him on trial, they have a right to. Even if someone else captures Osama bin Laden and handed him to the ICC, if it existed, the U.S. would still have the right to have first crack at him. So, you would need all the countries that have jurisdiction to agree to let the ICC keep him. And none of this, of course, answers the question how you could actually bring bin Laden or others to trial.
Thats the biggest obstacle to using global justice against al Qaeda.
Its just not so easy. One of the controversies people talk about relating to September 11th is whether you employ a law enforcement or military approach. In countries where a law-enforcement approach is possible, then that makes sense. But thats not possible in Afghanistan. Talking about the ICC, or any other instrument of international justice, is not like waving a magic wand. And it certainly doesnt help you capture these people or actually bring them to justice.