As much as the idea that US policy has an effect on the way others view us and greatly increases the chance that we will be attacked by psychopaths is unappealing, it has truth to it. No one is justifying terrorism. Such theories are simply pointing out the cause-effect relationship, independent of morality or emotion. Similarly I don't blame the person who walks in a bad neighborhood at midnight for getting mugged and killed, but I do think that it was not wise. Blame is not part of the equation.
What is important is that we look at these things from all angles to see what can be done wiser on our part. We can't do their part for them. While Chomsky's view has flaws, so do all others. But somebody has to give that view or we're missing part of the whole view.

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