I believe that -- in popular lexicon -- there is a difference between the fundamentalism you speak of, and that which was addressed in the question. Further, if you simply look up the synonyms to "fundametlaist", you will find the entry of "Fanatic". Perhaps the term "Orthodox" applies better to that of which you speak. For, now when we speak of fundamentalist, we usually mean one who takes their religious interpretations to fanatical hights, killing or supporting killing (or would you not agree)?
Perhaps I will leave that at that, and seek to address the rest of your reply. Because you point out instances such as movements againsts "drugs" and "fire-arms" as indicative of fundamentalism. Yet, as near as I can tell, fundamentlism is not at the heart of these movements. For instance, the secular Left is for gun control in our society; the political Left being the least fundamentalist (by your definition) in the US. But so too, by the other two examples, one could not possibly accept Chomsky's claim that the US is the or one of the most fundamentalist cultures. I am sure you do not need me to point out the appeal of guns, sex and drugs in the popular culture of the US. Indeed, the culture of the US (I might argue) is less fundamentalist than certain sections of the political party now in power. The culture is not. Turn on your television; it cannot be escaped, sadly. And I do not say sadly due to fundamentalism, but simply to do a desire for a break in monotony.
Thanks for the reply, and regards,
Fan