"Today the military does almost everything except defend the United States...Terrorism remains the most obvious threat to America, but it is no substitute for the Soviet Union. The reason groups like al-Qaeda attack civilians is because they lack serious weapons. Terrorists threaten to kill hundreds or thousands, not destroy nations. Moreover, every intervention risks creating more enemies and promoting more terrorism. The issue obviously is complex, but history demonstrates that terrorism is a common political tactic. Until recently the most prolific suicide bombers were the Tamils in Sri Lanka."