Evans' points out that (as Greece shows) there is a potential for the hard-left to take off too. It was the threat of 'proletarian democracy' (as I call in in my book) that seemed to undermine the efficacy of liberal constitutionalism in many people's eyes in the inter-war period. When selling the new German regime to international opinion in 1934, Goring was careful to prioritise its achievements in rolling back the subversive Left:
Hitler's mission is of importance for the history of the whole world, because he took up a war to the death against Communism and therewith raised a bulwark for the other European nations. ... It is our solemn belief that if, in the mighty struggle between Communism and National Socialism, the former had won, then the deadly bacillus would have spread from Communist Germany to the other European countries. The day will come when the other countries will begin to realize this, and on that day France, England and other peoples will be thankful that at that critical moment there was an Adolph Hitler in Germany.
[Hermann Goring, Germany Reborn (1934), excerpted in Carl Cohen (ed.), Communism, Fascism and Democracy: The Theoretical Foundations (New York, 1962), p. 395.]
Of course, inter-war Fascism railed against cosmopolitan capitalism too. Capitalism looks fairly secure now, and in the EU there is a formidable institutional shield against the 'excesses' of democracy in the shape of a trans-national European elite, and the dictature of the Bond Markets. Given the screaming pain of austerity, pretty clearly self-defeating in terms of economic recovery, its not clear how long this will last. If the 'threat' to Western civilization begins to extend from Muslims, immigration, Roma, Eurocrats, 'the bankers', etc., to 'class war subversives' of the Left, then one might see a yet more dangerous development of neo-fascism.
Anyway, it's a fine article, and another strong reason in particular to revisit Evan's stunningly good book on the rise of the Nazis.