The world is not an either/or affair, alas. While, indeed, there are those within this country exploiting the so-called "War on Terror" for nefarious ends--on this we agree--you are wrong that there is no existential threat to the West and to America from radical Islam. I don't expect to convince you of this. You are in your conceptual bunker and are doomed to stay there apparently.
A vanishingly small tranche of Muslims are ready to fight in some global jihad? Well, I think you can say the same of Americans willing to fight for liberty, no? And Islam is no threat to the West? Arm them with nuclear warheads, even a few, and see how well your world handles the loss of London, Paris, Los Angeles, or New York or even a coordinated EMP attack. All I can say is Americans really have no idea any of this would mean to their lives.
Yes, I am off the deep end. Believe that. And keep believing it as one MENA state after another falls to radical forces with the active collusion of Islamic-sympathetic forces inside this very country at the very highest levels. Keep believing it as this country is riven to the core and drifts inexorably toward irreversible division that cannot end in other than a cultural conflagration that even secession--which you also wrongly believe is far-fetched--will not be able to heal.