I am wading through Defeat and Division: France at War, 1939–1942. It is very good and I recommend it to you. It discusses all the well-known details of the military side of the French defeat. More importantly, it also explains the rise of Vichy.
I call this the post-Dreyfus epoch if only because I know nothing about France before 1894.
The basic cause of the French defeat and the establishment of Vichy was that French generals and admirals were no darn good. But how so? Very simply, the senior French officers felt themselves better than the Republic as well as the public.
You see from their point of view, the French people included Jews, Freemasons, Communists, intellectuals, politicians, free-thinkers and others who did not hold loyalty to France first. Even the vast levee en masse could not be trusted. Only the senior officers could be trusted to put France first.
Or to say it another way, the senior leadership thought only they could be trusted to save France from the French. All those sub-groups were loyal only to themselves, not to the nation. Therefore, the brass hats had to hang together. (So they were doing just what they accused the others of.)
So how did that lead to defeat?
The French general officers wanted to win. They did not throw the game. But when it came right down to it, it was more important to defeat the real enemies of France than to beat the Germans. It was better that France surrender and become a puppet state than it fall under the control of groups outside the senior military leadership.
In fact, the fire of defeat would burn out the sins of the decedent French and so save France. Or something.
Looking back on it we can see how circular and illogical it all was. But in the moment, they were caught up in their own internal logic.
Now, take the next step. How about the increasingly fractured American people? Some of us would make defeating the Liberals (or Conservatives) our main priority even if faced with a external enemy. Some would kiss up to the Russians or the Chinese to protect America from those other Americans.
What think you?