Then they wouldn't have been Nazis.
The whole attack on the Sovjet Union was driven by the ideology that Germany needs "Lebensraum" and that the natives were sub-humans who need to "disappear" so that German settlers can follow.
Without that ideology, no attack on the Sovjet Union would have taken part.
That's not entirely true. The Lebensraum idea had several components, only one of which was racial. Another was economic. The Nazis wanted to create an internal market sufficient to create an economy not reliant on exports, in order to compete with the United States. It could do that through direct conquest, but it also could do that through a system of puppets and allies, much like Napoleon did with the Continental System.
Whether the Nazis would ever separate that out, I agree that it was really unlikely, especially for people like Himmler. Either way though, the point is that Lebensraum was an entire system of thinking regarding Germany and its future that led to war against the USSR, not just racial. Even if Germany didn't care about the racial aspects and genuinely wanted to create allied states in the east for an internal market, it would need to forcibly break those states free from the USSR to do so.
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