Noam Chomsky is notoriously anti-American, and always writes his articles with a slant on U.S. "imperialism", with no regard for anything the U.S. did right, or anything the U.S. was compelled to do to protect itself and its interests.

The reality is, Iraq violated 12 years of U.N. resolutions and inspections, that more than warranted the Iraq invasion. And the U.S. was the target of terrorism before the Iraq invasion.
And the U.S. troops poised in surrounding areas and no-fly zones across Northern and Southern Iraq for the last 12 years (in half-measures short of invasion, in order to comply with U.N. mandates) at least protected non-Baathist Iraqis from complete annihilation.
And when the invasion was done, it was with a minimum loss of life, among both Iraqi civilians and Iraqi military. Arguably among the most bloodless wars ever fought.
And the stated U.S. goal is to bring freedom and democracy to the Middle East. If the U.S. has its way, Iraq will be free and independent within 2 years. Only biased propaganda could accuse the U.S. of other goals, when the purpose is so clearly Iraq's prosperity, democratization and independence.

The reality is (as Chomsky's blame-it-on-America rhetoric perpetuates) no matter what the U.S. does, it can be re-spun to rationalize terrorism on the U.S.

I don't think the U.S. invasion of Iraq either increases or decreases the threat of terrorism, at this stage. Although those who are blindly anti-American, like Chomsky, will always spin it that way.
If U.S. presence in Iraq successfully creates a beach-head for democracy in the Middle East, it will spread prosperity through the region, and decrease the motivation for terrorism in the future.

I shudder to think what would have occurred, if we had NOT invaded Afghanistan, and wiped out the Al Qaida training camps there.