I'm reminded of something Judith Shklar wrote in a festschrift for Stanley Hoffmann, describing the latter's attitude toward ideology and ideologies:
He sees [ideologies] not only as inevitable, but as necessary functions of democratization and of democratic public life once it has been institutionalized.... Ideology [in Hoffmann's view] is as positive as it is a necessary part of political action. To be a citizen is to have an ideology. Without ideology there would have been no resistance to Nazism, no heroism of the few who had a faith that led them to risk their lives to save the persecuted, and no will to defend human rights.(Judith N. Shklar, "Teaching Ideologies with Stanley," in Ideas and Ideals: Essays on Politics in Honor of Stanley Hoffmann, ed. L. B. Miller and M. J. Smith, Westview Press, 1993, p.62)