I think people confuse debatable decisions with bad decisions and robberies. There have been very few 'mainstream' robberies, a fair few bad decisions and many debatable decisions. For example (using Sweet Pea) Ramirez/Whitaker is a robbery; Whitaker/Chavez was bad and Whitaker/De La Hoya was debatable.
Young Stribling vs. Mike McTigue Bryan Downey vs. Johnny Wilson, probably the most flagrant in history Gunboat Smith vs. Georges Carpentier
I haven't seen any of them.I believe Smith may have been the victim of a referee being over zealous in his interpretation of the rules,but he is generally recognized as being a competent and honest third man.I saw a couple of fights recently where a boxer hit his opponent whilst he was on the floor ,and not even the commentators remarked on it.