Why has Allah banned gambling

Games of chance and intoxicants are banned in Islam, but why?

Verses 2:129 and 5:90 and 91 are quoted to show that the Holy Quran gives a balanced view of the reasons for forbidding intoxicants and games of chance — both have some good but their harm is greater than the good they do. In the UK while Weatherspoons, a company that operates ‘pubs’, places where intoxicants are supplied, announces a 37% increase in profits, medical research is published to show the detrimental affect that consumption of intoxicants has on the foetus.

The question about why everyone should be forbidden to consume intoxicants while harm is done to only a few is also answered.