Barack Obama said yesterday he would bring Osama bin Laden to justice in a way that wouldn’t allow the Sept. 11 mastermind to become a martyr. At a Washington news conference after huddling for the first time with a newly formed group of national security advisers, he acknowledged that bin Laden might not be taken alive, but suggested that if he is, the Nazi war crime trials at Nuremberg after World War II would be a good model.