Most of the topics we read are mostly mentioning about the negative side of gambling but I think we also discuss the positives of it...
1. Socialization
2. Income Generation
3. Employment
4. Support to the Gambling Industry
We've seen a lot of things enough to consider why gambling must exist. Maybe we just correct our views that gambling is bad because this also helps other people. We don't just focus on the bad things like addiction and debts that a person may commit by being an irresponsible gambler but also, must see the benefits it gives to the community and in our personal lives.
In addition to all that you listed above, one important benefit of gambling is that it makes one psychologically matured to handle money and also for risk. If you are a gambler, it will be difficult for anything to break you down because you would have seen it all while gambling. Depression, frustration and all manner of things would have been a common experience for a gambler. Even in business, you will not be afraid of taking risk because you are already accustomed to taking such risk on regular basis as a gambler.