Not very. How many Americans have been killed in terrorist attacks inside the United States since the September 11, 2001, atrocities? Arguably 16. Egyptian Hesham Mohamed Hadayet killed two Israelis at the El Al ticket counter at the Los Angeles airport on July 4, 2002. On June 1, 2009, Abdulhakim Muhammed killed one soldier at a recruiting center in Little Rock, Arkansas, ... MORE