In my view , gambling only wrong if you're messing your family, your friends when you lost. Borrowing money, scamming money ,... At that moment, your gambling is totally wrong.
I think gambling is wrong based on my religious views. And there is no doubt from me that I also agree that gambling is wrong. Although many people have their own views. That is human, always have their respective views. So everyone also just do what they want to do based on their respective views.
If you go in religious views wise then it will be a long talk. But you are right saying everyone deal with gambling with his own views. Some gamblers said that gambling is right becasue they are gamblers. But on the other hand, some people said that gambling is wrong and it is pure wrong thing basically, they don't like gambling. So everyone have their own prescription about gambling.