Banning the gambler won't do anything good to his gambling habit. He will just go to a different casino or gamble online. What I will do is I will invite a psychologist to the casino to talk to him abiout why is he still gambling everyday despite of his losses and his wife just gave birth. If that doesn't work then I won't be able to do anything for him anymore as it's not the casino's concern why he continues to gamble.
As for the casino worker, that is not enough reason to fire him. He is just concern to the addicted gambler and did not do anything to the casino's profit
Inviting a psychologist to Casino is a bit of a stretch for the attendant and the owner of the Casino, the owner of the gambling house didn't build it to change people's minds about gambling, it a place to make money from everyone. If I am to be in the attendant shoe, I would rather invite one home for him instead of pushing one to the Casino, that will even risk his job and relationship with the owner of the place. He is there to work and earn your money and not to start giving therapist to people, I don't think the owner will be happy by inviting a special person in changing the gambler's mindset.