If cops can't be manufactured, then let's re-assign cops from other areas of law enforcement and beef up the robbery units. Maybe it's time to re-write various vice laws, giving up the prohibitions on adult vice and put in regulatory vice laws, like we do with alcohol. Then police officers from the drug and prostitution squads could be re-tasked to the robbery unit. It will never happen though, makes too much sense. ;-)
Sorry...preventing robberies isn't a profit center. The crime doesn't pay, you might say.