In my opinion gambling is the mother of all crimes. When a gambler loses money in gambling, definitely he will become angry and will anger to get back his money and when he has no more money he will do illegal activities to get some money for gambling. This is a fact and I have seen many people doing this. Gradually they become professional criminals.
Okay, I think you are beginning to overstate things when you are saying gambling is the mother of all crimes, which means every crime that we see today, robbing, drugs, selling ammunition in the dark market and so on and so forth all evolved from gambling ? Oh please, in the past, crime may have been associated with casinos, but these days when casinos are getting license before they even operate, there are some things they just cannot do.
Now, shady deals depends on each individual and even in the absence of casino, there will still always be crime, so saying that gambling is the mother of all crimes which is just an activity that is even regulated in some places, is absurd.