Le conclusioni della ricerca di Robert Pape.

New research provides strong evidence that suicide terrorism such as that of 9/11 is particularly sensitive to foreign military occupation, and not Islamic fundamentalism or any ideology independent of this crucial circumstance. Although this pattern began to emerge in the 1980s and 1990s, a wealth of new data presents a powerful picture.
More than 95 percent of all suicide attacks are in response to foreign occupation, according to extensive research that we conducted at the University of Chicago’s Project on Security and Terrorism, where we examined every one of the over 2,200 suicide attacks across the world from 1980 to the present day. As the United States has occupied Afghanistan and Iraq, which have a combined population of about 60 million, total suicide attacks worldwide have risen dramatically — from about 300 from 1980 to 2003, to 1,800 from 2004 to 2009. Further, over 90 percent of suicide attacks worldwide are now anti-American. The vast majority of suicide terrorists hail from the local region threatened by foreign troops, which is why 90 percent of suicide attackers in Afghanistan are Afghans.