Everything is good if it is in moderation. Gambling is a way of releasing stress in old times just like what you said and its meant to be entertaining. But now that there are a lot of people getting addict because of the attractive pot money, gambling becomes a bad image. We should always think to go to casino to have fun, not to earn money.
Actually to be honest, in my country, gambling got banned due to the one and only factor that is stress. People in the towns and villages would gamble and upon loosing would get involved in either chaotic scuffles or would find it hell hard to bring home some food. The state knows that if you loose your money, you will be her responsibility and this is what led to gambling been banned. Though it is a way to enjoy and entertain but not considered good now to be promoted.
I hope our government will not think of that.
Gambling is stressful but for some people only, I don't believe that all or majority of the gamblers will have the same problem.
Most gamblers are responsible and they don't gamble much, gambling addiction are only for few so why ban gambling.