I think you extrapolate too much from OTL to evaluate the ITTL political movement in France.That isn’t entirely unrealistic in the short-term. But idk if the French people, who still remember that they were THE European power for hundreds of years, and once marched armies into Moscow, are going to permanently become “fatalistic.” Wary of challenging Germany again? Of course. Scared to commit to pan-European wars? Probably. Completely dejected and convinced that France is anything other than the greatest country on earth? Absolutely not. There are French people who complain, today, about German “domination” of the continent, and that’s after France won TWO world wars, and Germany stripped of large swathes of territory, much larger than A-L. The third republic will be correct and likely supported to act carefully in Europe, but any French government that acts like France is “finished” or “had their time in the sun, and it’s over now” will be overthrown. The French are to this day, even in the peak of American global hegemony, a very proud people. Any French government that does not act similarly proud of their place in the world will not long be seen as a legitimate government by the people of France. I don’t even think this requires an anti-German revanchist movement, as that will be almost certain to fail, but a France that, permanently, answers every beck and call from Germany or Britain, will likely be seen as little more than a foreign imposed puppet by the French.
ITTL France lost two major conflicts against Germany, the first at a perceived zenith of their power and the second as part of an alliance of several great powers and even that was not enough to stand up to Germany.
This has an impact on how people see their own nation and how they perceive its place.
The Great War was one of the last chances for France to regain its place as one of the dominant land powers of Europe, which they tried to do OTL between the wars, ITTL they no longer have the chance, because unless Germany collapses, Germany will always be a more powerful nation than France because of the differences in economy and population.
OTL, unlike ITL, the French had several points in recent history that allowed them to reinforce their existing worldview.
Victory in the Great War, the fact that they sided with the victors of WW2 and cemented this position with a permanent seat on the UN Security Council, their own nuclear deterrent and the fact that they were one of the leading nations in the predecessor organisations of the EU.
All this is missing and it is unclear to what extent the French government ITTL will be able to combine the desired perception with the current perceived perception.
The French are currently down, not only because they lost the war, but also because they were stabbed in the back by their ally England during the peace conferences. They have large war debts in foreign currency and their most important economic areas have been badly devastated. In such a situation, especially when there is no solution in sight, it is unfortunately not uncommon for people to leave political life and seek the safety and security of family.
This will only change when someone steps into the political arena who can offer a credible solution to the problems, whether he is a democrat, communist, fascist or monarchist.