Chomsky is no apologist for any form of terrorism! He has however ,forensically pointed out the state terrorism that his own country ,the USA has been involved with for many decades.
To take a few examples:

The CIA sponsored govt of Dr Allende in Chile in 1973 which led to the deaths of thousands of opponents of the military...many more were tortured,others thrown from helicopters into the ocean ,while others fled into an uncertain exile. Thank you Mr Kissinger and Richard Nixon.

Then there was the US attack on Vietnam in which around a million Vietnamese were killed and a country destroyed..it still hasn't recovered and the USA still has not compensated the Vietnamese for the death and destruction it caused.

Then there was the US trained death squads that roamed Central America in the mid 1980s killing tens of thousands of innocent people....we are seeing similar shadowy tactics in Iraq today....courtesy of the School For th Americas which trained a generation of torturers in Georgia,USA.

Saddam Hussein was a close friend and ally of the USA for many years right up until the end of the war against Iran .

There are others almost too numerous to mention.
hugo