Schneir points me to an excellent interview at the American Conservative about suicide terrorist attacks with Robert Pape, professor at the University of Chicago.

TAC: So if Islamic fundamentalism is not necessarily a key variable behind these groups, what is?

RP: The central fact is that overwhelmingly suicide-terrorist attacks are not driven by religion as much as they are by a clear strategic objective: to compel modern democracies to withdraw military forces from the territory that the terrorists view as their homeland. From Lebanon to Sri Lanka to Chechnya to Kashmir to the West Bank, every major suicide-terrorist campaign—over 95 percent of all the incidents—has had as its central objective to compel a democratic state to withdraw.

…TAC: So your assessment is that there are more suicide terrorists or potential suicide terrorists today than there were in March 2003?

RP: I have collected demographic data from around the world on the 462 suicide terrorists since 1980 who completed the mission, actually killed themselves. This information tells us that most are walk-in volunteers. Very few are criminals. Few are actually longtime members of a terrorist group. For most suicide terrorists, their first experience with violence is their very own suicide-terrorist attack.

There is no evidence there were any suicide-terrorist organizations lying in wait in Iraq before our invasion. What is happening is that the suicide terrorists have been produced by the invasion.

…TAC: There have been many kinds of non-Islamic suicide terrorists, but have there been Christian suicide terrorists?

RP: Not from Christian groups per se, but in Lebanon in the 1980s, of those suicide attackers, only eight were Islamic fundamentalists. Twenty-seven were Communists and Socialists. Three were Christians.

…TAC: Does al-Qaeda have the capacity to launch attacks on the United States, or are they too tied down in Iraq? Or have they made a strategic decision not to attack the United States, and if so, why?

RP: Al-Qaeda appears to have made a deliberate decision not to attack the United States in the short term. We know this not only from the pattern of their attacks but because we have an actual al-Qaeda planning document found by Norwegian intelligence. The document says that al-Qaeda should not try to attack the continent of the United States in the short term but instead should focus its energies on hitting America’s allies in order to try to split the coalition.

What the document then goes on to do is analyze whether they should hit Britain, Poland, or Spain. It concludes that they should hit Spain just before the March 2004 elections because, and I am quoting almost verbatim: Spain could not withstand two, maximum three, blows before withdrawing from the coalition, and then others would fall like dominoes.

That is exactly what happened. Six months after the document was produced, al-Qaeda attacked Spain in Madrid. That caused Spain to withdraw from the coalition. Others have followed. So al-Qaeda certainly has demonstrated the capacity to attack and in fact they have done over 15 suicide-terrorist attacks since 2002, more than all the years before 9/11 combined. Al-Qaeda is not weaker now. Al-Qaeda is stronger.