If the story of the mice in the kerestirer book is to be believed, the protection came from a bracha from the rebbe due to the eirlichkeit and tzedakah of the person seeking protection, not due to some protective charm of a picture.
To quote a famous Brooklyn Rav it’s a bezyon to kavod hatorah
But in this day and age am haratzus and seeking a quick fix seems to be common practice from the masses
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