Xenophobia isn't just race, it's also nationality. Italian fascists were very much big on the superiority of the Italian nation and Italian heritage, and loved to trumpet the ancient glory of Rome. Fascism absolutely does have as one of its core tenets that our race/culture/nation/whatever is superior and that we can't allow it to be contaminated by outside influence. It also has imperialism as one of its core tenets, and that's a suicidal combination.
You make a sarcastic point about how Nazi Germany got very powerful in the shortterm and then a few sentences later point out your own strawman by remembering that I'm talking about the longterm, because that's the scale the Imperium operates on (and also the scale most fascists intend to operate on, even though it usually ends poorly because running your nation on a philosophy that specifically declares that all your neighbors are evil is a terrible, terrible idea). For the record, the point when fascism begins to expire as an effective policy is the point about twenty years in when a full generation has been raised under its thought-stopping propaganda, which dramatically inhibits a fascist nation's ability to produce new engineers or scientists, and their military, espionaige, and economy all enter into a decay soon after - at least, if their combination of xenophobia and imperialism hasn't caught them in the jaws of a destructive war against a vast alliance of nations by then.
The whole post is kind of incoherent. You bring up democracy, a word which literally does not appear once in any of my posts (until now, at least). You make a rambling point that seems to be making some kind of point about how even nations thought of as democracy don't tend to be genuinely representative of their people, but you fail to connect that to the actual conversation or explain how that makes the Imperium's philosophy less catastrophically inefficient. Just because the Imperium's particular brand of autocracy is counterproductive doesn't mean all autocracy is counterproductive.
But I'm not even sure if that's what you were getting at, because your post is just shy of being word salad. Seriously man, are you drunk?
Edited by Lupa