One thing is certain, gambling is not always considered bad, depending on how we view it. Some people consider gambling to be entertainment when they are tired from work. I think that as long as we gamble within a reasonable budget, do not exceed what has been set, and are aware of the risks involved when deciding to start gambling, in other words, become responsible gamblers, i don't think there will be any problems with it.
Gambling is never bad, people that had bad impression towards gambling had a reason for that and the reason is not far from being as a result of addicted gamblers. Since gambling have been in existence to date, if there was no body that got addicted and had their life destroyed, would anyone see gambling as something bad? I doubt not. Some people see gambling as an activity with bad effect because of addicted gamblers, if everyone were to gambler responsibly, no body will talk against it.
Gambling is not a bad thing until a person gets deeply addicted to gambling and gets out of his normal life. Many people enjoy gambling and many can profit from it by using their own strategies, at that time gambling seems to them to be a very good thing and they enjoy it very much. But when someone continues to gamble even after not being able to win from gambling and gambles even after neglecting his important activities, then it is bad for him. However, before gambling is considered a bad thing, one has to keep himself within a boundary where he will only enjoy gambling but never become addicted.