Why not skip the middle step?
Go ask the NATO bloc and their supporters. The obvious and surface answer is that it has to do with making for an easy “us-vs-them” identifier. “Of course they’re bad, they aren’t white like us good wholesome folk are, who are inherently good and wholesome because we’re white, and being good and wholesome makes us right and correct in what we do and you can tell because we’re white. The ones who are bad clearly aren’t like us. They’re not white!” Yes, it is circular reasoning and garbage logic. But I don’t know why you’re getting pissy at us for that instead of the dipshits white people who keep moving the goalposts on the meaning of whiteness, as they always have done to suit their agenda. Take it up with them.
You were asking about the shifting nature of the meaning of the term whiteness. Go up and read your own comment to see how you related that to authoritarianism. If you can’t follow your own train of thought, then I can’t help you because it makes it apparent you’re not asking in good faith.
What I’m trying to explain to you is that “we” are not saying that. The people who use whiteness to justify their actions and otherize their enemies are saying that. This isn’t difficult.