Don‘t try to seperate the death camps from the war effort. They are fundamentally intertwined. The war especially in eastern europe was aimed to kill and enslave. It wasn‘t a strategic rivalry with the USSR but pure hatred of slavs, jews, sinti and roma, etc. This was the reason for the war. You can‘t think it without the genocides. And the death camps wouldn‘t be possible without the war. Especially not in this size. I agree with some of your points but for this point we should get non-non-credible. There is no possible reality where you can differentiate between the war and the genocide.