I'm not sure if someone who doesn't know the basics of the American constitution - incorrectly claiming that the First Amendment does not protect 'hate speech' - should be pontificating on the American system of government.
On the other hand, that you cite Chomsky and your 'research' into this matter seems to come from one source, I would say this is an excellent example of how Chomsky misleads or simply does not know what he is talking about - you would be exhibit A of someone who has drunk the kool-aid.
But on a more serious note, of course the United States is not a democracy. This is not exactly a secret, since the US constitution never claims that the United States is a democracy. The US is a republic.
But thank you for that 'duh' statement.
Perhaps you can get back to pontificating on the New Testament by quoting Jesus' comments from the book of Revelation - or the book of Revelations (sic) according to O Wise One ?
and that the actual policies that can be enacted are even narrower.
Err, that actually has more to do with the mostly moderate political views of most Americans.
Left leaning or Right leaning politicians are unable to effectively change or tilt the United States in any direction because their party must make accommodations (ie., dilute the message of the far Right or Left) if they want the moderates in their party to vote for them in the next election.
That incorrectly leads most Americans to believe that their system doesn't work when, in fact, it is the moderates who prevent any far and sudden shift in policy changes. The moderate majority acts as an inertia to politicians who would want to dramatically change a certain facet of federal, state or local government.