How can a man who was once a national hero become a traitor just a few years later?

I was thinking of Pétain, who was a great man during the First World War, for which he received numerous honours and was even made a Marshal of France


That same man, who had fought heroically against the Germans, decided in 1940 to surrender France to Germany and set the country on the path to collaboration


It is quite simply staggering
How can a man who was once a national hero become a traitor just a few years later?
How can a man who was once a national hero become a traitor just a few years later?
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