I've written on this topic before- but to turn the OP's assumptions on their head, German dependence upon Soviet raw materials meant that the Soviets held the German war effort hostage. It became quickly apparent to many German planners that a cutoff of Soviet raw materials would prove extremely detrimental to the German war economy. Although Stalin had thus far kept his end of the bargain in terms of the trade agreements of the Molotov-Ribbentrop Pact, there were indications after the fall of France that the Soviets would not be as accommodating in the future. The capture of raw materials from Western Europe gave the Germans a window of opportunity to attack the USSR and not worry about being cut off from Soviet supplies.

This does not mean that Völkisch racism and anticommunism did not factor into the German decision to invade the USSR, but these sentiments existed alongside the logic that Germany needed Soviet raw materials to continue the war.