Cheating

It is sad to still see on various penpalling/correspondence messageboards, fora and threads people contemplating or actually reusing used but unfranked/postmarked stamps. I had written a post about this earlier. It is illegal, fraudulent, cheating... Do you like cheats? Do you  like drug users in sports - should they be allowed to compete and win against decent, clean, hard-training athletes? I know the odd reused stamp is small in the great scheme of things... but from small things come bigger things. If people have no qualms defrauding the postal system... what would they go onto next? I wonder if there are any convicted murderers who have not ever dropped a single piece of litter, even if accidental and left it there?