For me gambling does not increase crime but rather increase addiction to some people who does not know how to handle it properly. When it comes to crime, for me the number 1 aspect is drugs next is poverty. I don't consider gambling unless it was also associated with drugs.
The addiction is the first thing that every gambler can get while they played gambling every day. But the crime effect is not just come only from gambling because the poverty is the one thing that might give an effect to the crime itself. So I don't think that gambling can gives effect to the crime, but maybe the crime can happen if the gambler needs money to continue playing gambling and he stole the money from other people.