I still don't understand the reasons why gambling is banned in some regions. On the contrary, some countries should review their laws on this matter. Why? Because people will have this kind of entertainment anyway. It started many centuries ago and this "tradition" has become a norm of life. So why should we change anything and establish our own prohibitive rules and laws? We shouldn't go against human nature.
Inasmuch as there's actually sense in what you're saying, the truth still remains that every government has the right to decide on what's best for them and their people, as well as to decide what is to be banned and allowed within their jurisdiction. There are several reasons why some people would feel as though banning gambling within their region would be the best option. For those who have accepted the common misconceptions of gambling, which is that gambling can automatically reshape their financial status (making them reach) gambling becomes problematic to them and in this case, it may not only affect them alone but also the society at large in one way or the other. It could be that there's a widespread of this scenario, which may have led the government of that region to believe the best option would be to place a permban on gambling, and if you really get to consider the situation and weigh the options, you wouldn't really have to blame them that much.