
Imams preach jihad and extremism in 10 percent of the 2,000 mosques in the  United States, the FBI estimates. 
That sums up the problem facing us as  we ponder the meaning of Army Maj. Nidal Malik Hasan’s slayings of 13 people at  Fort Hood, Texas. Given his association with a pro-al-Qaida imam in northern  Virginia and his preoccupation with radical Islamic Web sites, it’s clear that  the radical element of Islam influenced Hasan. 
About a quarter of the  Muslims in America ages 18 through 29 believe that suicide bombings can be  justified, according to a Pew Research Center poll. Generating those attitudes  are imams who preach jihad and hatred in American mosques and postings on the  Internet, according to FBI counterterrorism officials interviewed for my book  “The Terrorist Watch: Inside the Desperate Race to Stop the Next  Attack.”