During the assault on the compound, an attack could be launched in self defense of US soil. It might even be justified after the attack, in response to that violation of international law, but a prudent position would still respect international law and our Constitution, properly informing those legitimate authorities involved.
IMHO, I’d still like to see a trial involved, simply to afford due process, showing not only the charged, but the public that we really were going after the guility party, not simply a politically demonized target to answer mob psychology.
It still sounds like you expect 0bama to start obeying the law. Personally I’m more interested in charges brought against him than I am chasing down jihadis all across the African desert after we left the barn door open.