Until 2011, this was the face of international terrorism, al-Qaida leader Osama bin Laden and his deputy, Ayman al-Zawahiri. That year, President Barack Obama gave the go-ahead for a top secret mission to take out bin Laden, who had been found living in Abbottabad, Pakistan. The mission succeeded and for a long time much of the world relaxed, knowing the man who was behind September 11th was gone forever. Just three years later, the Islamic State took al-Qaida’s slot as the most dangerous terrorist organization, emerging out of the wreckage of Iraq with its signature brutality of beheading hostages and taking huge swathes of territory. A president once admired for acting boldly against al-Qaida is now under withering criticism for not doing enough to stop this latest incarnation of radical Islam. With the shooting deaths of 14 Americans at a workplace holiday gathering in California by a radicalized Muslim-American couple last week, a new poll shows Americans are now just as nervous as they were right after September 11th.