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If those who have money will consider gambling as a hobby, I think they will regret it especially if they often lose from gambling. Gambling is not a hobby that can be done by people because there is a loss factor that can make them lose everything in the end. Maybe if later there was a thesis issued by an educational institution about how dangerous gambling is to people, it would help them to think twice if they wanted to gamble.
I think this is a subjective matter. There are already articles and blogs about first hand experience on gambling that tackles its negative side. Most people are aware of it. For sure some managed to stumble and read upon several articles and confessions about the disadvantages and bad sides of gambling. However, people still choose to gamble.
If a person decides to engage in gambling, it's already their responsibility. The moment they enter, they knew what is waiting for them. Because in gambling, there are only two possible options which are to win or to lose. If a person have that much to spare to risk and makes it as a hobby, then good for him as long as he know his boundaries in playing so he won't lose everything in the process.
At the end of the day people have the freedom to use their money as they like, as long as you can cover your basic necessities and those of your family as well then the rest of your money can be used on whatever you like, if someone decides to use some of that money to gamble I do not see anything wrong with it, now it is true there are people which cannot deal with it and end up losing way more money than that and suffer long term negative consequences due to their lack of restrain, but fortunately their number is on the low side.