I agree with most replies. Gambling doesnt cause an increase in crime. It can be linked to crime in some areas but the other way around. Crime tries to get into the gambling industry to launder money.
Also think about nowadays. Do you think online gambling from home causes an increase in crimes? Not at all.
I want to even believe the idea of even associating gambling with crime is over stated and based on what some would have watched in movies with casinos being used for some underground deals, they just assume that every casino owner is dirty.
You cannot know who is dirty until you catch them dirty and one thing is that even though we may see some different caliber of people in the gambling world, that still does not mean crime cannot happen even outside the gambling environment. Criminality is only applicable to each individual and has nothing to do with gambling in its entirety.