Fascism is a political system established in Italy in a certain context. I think it can be debatable, as long as it shows the effects it could have had in its own context. Historical figures like Churchill or Ghandi were actually very envious of its economical and societal success. I don't endorse Fascism, absolutely not, but an analysis must always embrace all the aspects and replace them in a social context.Exploring the psychology of fascist characters is different from exploring the ideology of fascism. It's usually a way of examining why people turn to fascism in the first place. You won't find respectable literature or movies equivocating on fascist ideology though.
You could examine every historical events is this regard, as long as we have datas on it. USA helped liberate Europe twice, but why ? Motives were far from positive one, and the background of it is full of shades. But it is always presented as something heroic and positive, in place of a political, ideological and economical move.
I think it's always interesting to seek why some political systems were dominant in some period and how it was perceived by populations. History is not made to endorse things (at least modern History, things have changed since the 70s), but to understand. Moral standards are different from ours, you can't judge humans from the past with our own standards.
I truly have problems seeing the problem in, say, violent Drow society or Orcish intelligence malus. I don't understand why it would be of any impact for real humans or life.