What is the moral lesson of the story The Piece of String by Guy de Maupassant?

the one that fits it the best would have to be you never can be innocent once accused .you will always be thought of as guilty.when Maitre hauchecorne is accused of stealing the wallet because he was seen picking up the string everyone thought that he was a theft .after being accused a theft , no one even looked at him the same even after the wallet was returned by another man.This theme relates to theme of NECKLACE because both have to do with trust in people.
never accused anybody without authentic proof
not to be ashamed of who you are and what your values are.