For nearly a decade, Americans have been waging a long war against terrorism without much serious public debate about what is truly motivating terrorists to kill them….

A simple narrative was readily available, and a powerful conventional wisdom began to exert its grip. Because the 9/11 hijackers were all Muslims, it was easy to presume that Islamic fundamentalism was the central motivating force driving the 19 hijackers to kill themselves in order to kill Americans. Within weeks after the 9/11 attacks, surveys of American attitudes show that this presumption was fast congealing into a hard reality in the public mind. Americans immediately wondered, “Why do they hate us?” and almost as immediately came to the conclusion that it was because of “who we are, not what we do.” As President George W. Bush said in his first address to Congress after the 9/11 attacks: “They hate our freedoms: our freedom of religion, our freedom of speech, our freedom to vote and assemble and disagree with each other.”

Thus was unleashed the “war on terror.”

The narrative of Islamic fundamentalism did more than explain why America was attacked and encourage war against Iraq. It also pointed toward a simple, grand solution. If Islamic fundamentalism was driving the threat and if its roots grew from the culture of the Arab world, then America had a clear mission: To transform Arab societies – with Western political institutions and social norms as the ultimate antidote to the virus of Islamic extremism….

There’s just one problem: We now know that this narrative is not true.

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….

The United States has been great in large part because it respects understanding and discussion of important ideas and concepts, and because it is free to change course. Intelligent decisions require putting all the facts before us and considering new approaches. The first step is recognizing that occupations in the Muslim world don’t make Americans any safer — in fact, they are at the heart of the problem.

Robert Pape in Foreign Policy, 18 October 2010