I met Osama bin Laden three times. I’m sorry to say his story isn’t over.

Americans can find some small consolation, perhaps, in the fact that they managed to take revenge by hunting him down and killing him. But the bigger picture is less reassuring. Al-Qaeda still remains in Afghanistan, and its offshoots continue to wage war in others parts of the world. The rise of the Islamic State has shown that ideas even more extreme than bin Laden’s continue to find followers.