I don't think you are correct, can you substantiate that claim? Tell that to the residents of Oradour sur Glane, the males were all machine gunned in a barn and the women and children were all rounded up and put into the church and then the Nazis threw in hand grenades.
A huge part of southern France was under Vichy control, but not all were collaborators by any means. A lot of French males were used for forced labour building the Atlantic wall and other installations and a lot ended up in Dora or worse Natzweiler..
The French capitulated in 1940, most run away of surrendered, they had a vast part of their army they did not use. The British 51st Highland division was forced surrender to the Nazis in St Valery, even thought they want to fight on, because they were under French command and the French would rather collaborate than fight.
The vast majority of French people and armed forces supported the Vichy collaborator regime. They help the Nazis round up Jews and others.
The only real resistance happened after the Nazis invaded the Soviet Union in mid 1941, and then only by communists.
The resistance grow in 1943 when the Nazi started to force the French to work in Germany and many of those selected when into hiding, but the majority of them did not fight. When the majority of French saw who was going to win the war they changed sides as they had done in 1940.
When the British Commonwealth forces invaded Vichy control Syria to stop the Nazis, the Vichy forces fought them and killed British forces and hand British prisoners over to the Nazis. When the British won they gave the captured French forces the choice between fighting the Nazis or returning to the Vichy French, over 95% choose to join the pro Nazi Vichy government.
There were a small amount of French who were willing to fight the Nazis under De Gaul, but not many.
France unlike most countries did not have a public enquire after the war as they knew what its findings were.