What you have mentioned is not a problem of a casino or gambling itself. It's the lack of the parents' supervision of their child doing things like gambling. I live in a place where gambling inevitable even for grade schools but because i was disciplined enough i never got a problem to it or even gambling at early age, well even at my college days. I always do things that will not bother especially in moral ways. But now that i'm adult, don't expect doing the same but with still moderation.
Also, businessman and governments love gambling, it provides both money, entertainment and tax.