A) Godwin's Law, having to resort to testing unfamiliar ideas against the most infamous mass-murdering dictator in history generally means you've run out of better arguments.
B) It's ignorant and dishonest not to see the similar authoritarian tendencies (nationalism) within this society albeit not as spectacular perhaps (not yet anyway). If everyday people were to responsibly ask, in good faith, what traditions, what principles, and what philosophical ideas lead to that mess, they might then instead recognize the utility of those that sought to avoid it. However modest it may be, anarchist ideas could very well be influencing society at large in some small measure (and thus perhaps all the more vital!).
C) As dot's first comment alludes, the hideous spectacle that Hitler became would not have been possible under radically different social, historical, material, and economic conditions.
D) Hitlers forces were eventually weakened by oil/gasoline shortages. It's difficult to imagine how such problems would play out these days given that states now have to contend with peak-oil limitations in both war and within civil society. Hard to say with certainty but we don't know if "Hitler" is even possible in the same way, or on such a grand scale, in the new millennium.