It's fair the ppl who've benefited from gambling will tell you there's nothing wrong with gambling. It's their choice about how they're going to get excited because it's their money & it's their right to enjoy their life. If they aren't careful enjoyment's going to become addiction.
There is a limit to everything, and if a gambler understands that limit, they can stay away from addiction. When they get something good out of gambling, then a gambler starts to consider himself an expert. And because of this expert thinking, they start making wrong decisions, which eventually leads to major bad situations and even gambling addiction.
I have seen many gamblers who were once big winners and had large sums of money, but then became addicted to gambling due to overconfidence, thinking they were experts, and eventually lost all their winnings.