Gambling can be fun, sociable and rewarding (okay, rarely rewarding)
Gambling can also be miserable, antisocial and suck all your money.
I've gambled before, I've been to casinos, I put £2 a week on the Football and Friday nights are usually spent around itboxes with mates, trying to beat Deal or No Deal. I've lost money, but I've had fun, and suffered nothing worse than developing a deep hatred for Noel Edmonds.
It can screw people up, but these people may have been screwed up by alcohol, drugs or something else. A number of people can enjoy gambling responsibly, like a number of people can enjoy alcohol responsibly. It does annoy me that certain aspects of the UK media don't want to build super casinos (which will provide taxes & jobs) because of the moral argument. Roads kill people, doesn't mean we don't build them.
I'm watching this topic for interest for the first person to say "gambling is wrong" and link to a casino affiliate site in their sig.