From a report so secret that they can't tell us what's in it, exactly, cause it's classified:
A stark assessment of terrorism trends by American intelligence agencies has found that the American invasion and occupation of Iraq has helped spawn a new generation of Islamic radicalism and that the overall terrorist threat has grown since the Sept. 11 attacks.
Does this proceed by the same logic as the idea, harbored by my mother, that leaving food out created cockroaches?
No-one can say that there would be more, fewer, or the same number of terrorists if we were not at war in Iraq, because we are at war in Iraq. We would need an alternative universe to test this hypothesis, one in which we were not at war in Iraq. We could compare the two and see how many terrorists there were in our alternative world. But we're way past hypotheticals here. The only question which has any relevance is, what do we do now?