The nation-state idea has to be put in a larger developmental model. It can be a force for either utilitarian-style nationalism or classical liberalism. It is its use in the former sense that some modern liberals are suspcisious of it, but in the latter sense these same people are among its greatest defenders.
Beet,
The nation-state is BOTH a force for classical liberalism AND a force for the utilitarian-style nationalism that you seem to equate with fascism, but is really just an expression of faith in the value system of your country.