There is no reason to say that Gambling is bad for society even it may contribute to being affected nationally. Gambling not only affects the people who are gambling and as it is related to money it affects the members of the family, friends, relatives, and later on the nearest people, and in this way, it affects the whole of society.
Yes I agree with you that geographically in many societies gambling is considered a bad habit yet there is a large number of gamblers. People who gamble are socially isolated and viewed negatively, but controlled gambling can be positive for people. For example gambling should be considered by people as a form of entertainment which is not only a source of income but many people consider it as a source of income and lot of lost money. He is in social and family disaster. If a gambler can allocate a limited amount of money for gambling, he can allocate spare time to gambling in addition to meeting family needs.