How did France reconcile the people who resisted with the people who supported the occupiers? I know a lot were executed (?), but it can't have been all of the people who supported Petain.
We moved on, accepted that we fucked up, that most people were trying to survive in a pretty shitty situation, had responsibilities for their families, for their friends, and that you can't realistically ask everyone to be a hero. To quote de Gaulle, 500,000 heroes, 500,000 bastards, 30 million sheep. Those who really went out of their way for one side or the other became heroes or got executed/lost civic rights/etc., and the rest? They had to live with their conscience, with the knowledge that they kept their head down when shit happened.
There isn't the British delusion of the entire nation resisting and being strong. The Brits were just the same as we were: they followed suit nicely, but those they followed won the war, so they think themselves all big damn heroes as a nation, that when push comes to shove, they'll end up on top due to some sort of national spirit. Here, not so much, we have a shitload of reminders of our sins, literally engraved in stone in various parts.
If your French isn't too rusty, I think you'll realize the implications of the plate. Furthermore, the duty of remembrance is still pretty strong to this day, with for example the highest administrative court, during the Papon case, making it into jurisprudence that there is a clear and legal continuity between the Pétain administration and the current administration, that the government of our darkest hours was indeed our government, that there is no escape from our responsibility (hell, in comparison, the judicial system in Italy held its ground a lot, lot more under Mussolini than our administration). That France was as much de Gaulle as it was Pétain.
And that neither UK nor the US went through this deep hard look in the mirror is one of the greatest tragedies that ever happened to their nations, in my opinion. They think themselves above of these very human instincts, and populists are no able to get through to them much more easily.