Answer: We have no legal responsibility but do have some ethical responsibility.
Explanation: As the owner of a casino we do not have any legal liability but as human and a part of society we do have to make sure that gambling in such casinos is not ruining the environment for the individuals living in it.
We have the responsibility towards the kids especially. We must make sure that kids stay away from such casinos as no one knows at an early age of what is right for them and what is not.
We can make rules about the maximum amount of which one can gamble and should monitor strictly of any other unethical conduct that is going on.