Criminologists should study how to reduce crime. Advertising the punishments for common crimes in high crime areas is one idea. Why doesn't the government say, "we have 10,000 signs we would like to put up this Saturday and we are looking for volunteers; we would love for you to help." It would be very efficient, and we would have a community sort of feeling. Maybe that would work or be worth it, maybe not. Let's try it. Why are we so uncreative? Do we actually want reduced crime, or do we have this crazy idea that we need criminals to get arrested and go through The System? There are many more ways to affect crime, even relevant to crime (not education, welfare, etc), that are still much outside the traditional scope of law enforcement and the justice system.