D-Day happened not because of some altruistic desire to liberate France but because the remaining capitalist states saw that Germany was neither salvageable nor willing to work with them, and something need to be done to stop the Soviets from liberating all of continental Europe and building a socialist bloc with abundant year round naval ports in the open Atlantic.

Prior to the war Nazi Germany was chomping at the bit to destroy the Soviet Union, and the Soviets wanted to take a wrecking ball to Germany, both for the sake of destroying the political epicenter of European fascism, and so they could keep pushing the revolution westward and take the entirety of the continent.

The Western alliance with Poland was an attempt at managing this rivalry, so that they could try to force this nearly inevitable conflict to happen on their terms, not Germany nor Russia’s. The West must have seen that if Germany won this fight and had their pick of whatever they wanted in Eastern Europe, France would end up with a monstrous neighbor that occupied the entire rest of the European mainland, and although Communism would have been uprooted from Russia, Germany could easily use its newly acquired land/resources/industrial capacity to double back and take on France. The goal of destroying the Soviets is achieved, but the Fascist bloc becomes the dominant faction of the imperial core and the anglo-Liberal forces are forced to either submit or try to hold out as just the UK and US against the rest of the world.

Now, if Russia were to win this impending Russo-German war, there was no way in hell Stalin slows his roll after beating Germany and stops at the French border— France and possibly Franco’s Spain would be next, and where does this leave the West? Unlike a German victory, the anglo-Liberal faction of the imperial core is all that’s left and they are stuck with the entire European mainland controlled by communists, an outcome they’ll do anything to avoid. With the shipyard of Germany and France and access to the open Atlantic, they can threaten anglo naval superiority and even plan an invasion of the British isles— and unlike Hitler, who represents just another faction of capitalism, Stalin and the communists are far less likely to give the remaining Western countries the option to accept subservience if they lay down their arms.

So the West find themselves in a position where if they do nothing in this coming Russo-German war, they are screwed either way, and although a Nazi victory is preferable, they figure that through geopolitical fuckery they can get involved and alter the tides. If they side with the communists, which god knows the Western governments broadly speaking do not want to do, they can at least manage the fall of Germany, and hopefully negotiate a post-war European order where the Soviets do not have access to the open Atlantic (i.e., ports that aren’t in an inland sea or the hard to navigate Arctic). D-Day was of course an attempt at taking back territory in France but more importantly it was the first step toward securing a foothold in Germany and making sure that there was a mobilised, battle-hardened force waiting to meet the Soviets so that a hard limit could be put on their Western advance. I don’t mean to say that no one wanted France back under a French government, or that there weren’t people in the anglo military commands and governments who were genuinely disgusted by the Nazis and the crimes committed continent-wide during their occupations, but to the cold, realistic, realpolitiking minds of the people at the top like Eisenhower, the primary goal was setting up the board for the next fight— the Anglosphere versus the Soviet Union.

US General George Patton was adamant that if he was allowed to, he could have taken American troops to Prague and secured Czechia for the West in the post-war order well in advance of the Red Army’s arrival. He was promptly informed by Eisenhower that he would be doing no such thing. The post-war order had already been negotiated behind the scenes, and through strategically supporting their mortal enemies against a foe that really wasn’t much different than themselves politically or economically, the intact West had made sure that they also held at least part of Central Europe, instead of either Germany or the Soviet Union controlling the entire continent. So D-Day wasn't purely an anti-communist action, but was also crucial to the Western grand strategy of making sure the Soviets didn’t just keep steaming onward, and setting the stage for the Cold War in terms more favorable to the West.

credit to @FLAMING_AUBURN_LOCKS@hexbear.net