Casinos are gambling as a business. Individuals are gambling for fun. Why should government get a piece of coin every time money changes hands?
In the case of a gambling ring, I can see busting the organizers, but I can’t see busting the participants. Government has an interest in taxing a business and regulating a trade notorious for cheating. In the case of a casual poker game, though, I don’t think government has any business outlawing it. Perhaps putting some limitations on how high stakes can go and still be a private game, but certainly not making it illegal altogether.
That said, I oppose gambling on a personal level. Nothing wrong with a little fun with spare change, but it is a slippery slope just waiting to send someone over the edge. But my moral feelings are not grounds for legislation unless society at large agrees with me— and it doesn’t.