"Radical" Feminism

In the Crisis magazine article "Don't Say Gender When You Mean Sex" the author in referring to feminism and its damaging affects on society (which I certainly concur with) without exception uses the modifier 'radical'. I find this the default modifier when even concervative critics speak of this ideology. It seems as if they are almost afraid to voice a veto of such an cultural phenomenon as feminism. Questions arise in my mind: Doesn't the use of 'radical' imply that the regular unradical version is fine and leads to the bliss of the egalitarian family? Otherwise I cannot see why the noun would not be enough. In other words an apple can be a red apple, even a radically red apple and yet it is still an apple, albeit a poisonous one. Do we speak of 'radical communism' or 'radical antisemitism' or 'radical nazism'? So then I must ask why this ideology is so unique as to be critiqued only when married to its modifier?