Obviously, not all angry young Muslim men are engaging in violence -- nor, of course, are all Muslims terrorists. But many terrorists are found to be Muslims. Ms. Khan's remark purports to explain the linkage.
It is perhaps no coincidence that Mr. Khawaja has Pakistani roots. In recent years, Pakistan has become a haven for al-Qaeda terrorists. For longer than that, jihadis have recruited Pakistani boys and men to fight in Kashmir and Afghanistan. These brainwashed men may be volunteers headed out to fight infidel "invaders" and "occupiers" of Muslim lands, but it cannot be said that they are acting entirely on their own initiative.