President Barack Obama should be applauded for his risky—and lonely—decision to take out Osama bin Laden. But in announcing bin Laden's demise, the president fudged a vital fact. Echoing George W. Bush, he insisted that al Qaeda's icon "was not a Muslim leader."

But this is untrue. Bin Laden and his followers represent a real interpretation of Islam that begs to be challenged relentlessly and visibly. Why does this happen so rarely?

"Moderate"...