When Hitler attacked Poland, he took on the same status as Hitler. When Hitler attacked the Soviet Union, we had every option not to declare them an "ally."
IOW, there is no dishonor involved; your point is specious.
You referenced Patton.
In the later days of the war, he wanted to ally with Germany and attack USSR. That is what I was referencing.
You are making the assumption that without US support the USSR would have continued to fight the Nazis, tying up 90% of the Wehrmacht so we wouldn’t have to fight them.
IMO a more likely scenario is the USSR collapsing in 1942, with the Germans taking control of as much of it as they wanted, probably over to the Urals. This would have given them all the oil and other resources they needed, especially since troops released by the collapse of the Red Army could have been diverted to Middle East, squashing the Brits and taking over all of North Africa and to Iraq.
They would then have had two years to build the defenses of Fortress Europa. I believe that quite literally we could not have forced a landing on Europe or in North Africa against a German Army fighting only on one front.
Now the war would still have ended in 1945, when we nuked Berlin, and arguably that would have been a better outcome than what actually happened. But without nukes we could NOT have defeated a Germany Army unencumbered by the Eastern Front.