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.