I don't reslly see gambling as something wrong that it can by itself ruin your life. All people make choices and these cboices define whether what you're doing is wrong or right. If you do excessive gambling, then obviously the results would make gambling a bad activity. If you do it responsibly, then gambling would be simply a form of entertainment where you can get relaxation and stress relief
If you are not matured enough and you enter gambling, the outcome is not good because you will likely will not understand how to react on a certain situation. There are good times and bad times in gambling, what's important is we know how to manage ourselves in bad time, we lose and that is true but if we accepted that, it will not affect our life. Whatever the outcome, there is nothing to be blame, we gamble here by ourselves and we are not force to do it.