If we're talking about real casino i agree with you - near casinos you can often see criminal groups of bandits and robbers, it's not safe. But if we're talking about online casinos - that's a great way to enjoy the game you love in a safest way.
I have been to Casinos before and all these things some of you are saying is untrue. Sure, certain people tend to drift towards a hide out when it comes to crime and they may want to use a casino as a cover up for their criminal activities and as a result of that could make the surrounding become more of an immoral ground based on the caliber of people going there. Now, if you go to a local casino where there is possibly no regulation or thereabout, things like this can always happen, but for some casinos, you would not even know there is a casino unless you are told, as there is usually serenity due to the caliber of people there, things are curtailed and since they would not want to jeopardize their business, all these things mentioned will not even be the case.