That was an ideological difference between the two that prevents the Germans from being willing to surrender German territory to the Soviets...
That wasn't the biggest reason that the Germans fought so much harder in the East during the final days of the war. They considered the Soviets to be little more than animals, and if you'll read accounts of how they acted, e.g., raping every female they found from 8 to 80, you'll see that the Germans were, to some extent, trying to make sure that they surrendered to the western allies, who they could trust to act in a civilized manner. Aside from that, I have no disagreement with your premise.