History shows that there are no enemies more deadly than armed Americans in a scrap.
While I certainly hope that your asessment of Americans' courage is true, I don't think we're really that much better off than the Euroweasels. What, exactly, would it take for us to "snap" (to our senses) - since full passenger planes being flown into skyscrapers wasn't quite enough, evidently? A nuke?
Yes, it's true that those in some states we are better armed than the Euroweasels, but the second amendment is seriously compromised as it stands: State militias were essentially abolished via federalization; and the citizenry is effectively denied access to the same weaponry as the military or police (or the jihadis and drug gangs, for that matter). At the same time, there is no limit to the number of Muslims who can come here through the various immigration and refugee programs nor is there any effort to discourage them from coming or even expel those here illegally.
Auster's point is that we cannot prevail against the jihadis as long as we continue to embrace essential liberalism - the idea that the Muslims are basically just the same as we are, that Sheikdoms can be transformed into a Swedish-style utopian welfare-state with the infusion of billiions of tax dollars and free elections. Until we reject liberalism and embrace the concept that our own (traditional) nation/culture is far superior to Islam and is worthy of defending against Muslim conquest - the very essence of discrimination - we will continue to lose ground.