Experiencing a bad experience yourself is the most valuable lesson. You may not see a change if you don't go through that experience yourself. Especially if the result of betting with your last money is a win, you may keep repeating that situation to try to save your weekend from hunger. Every gambler has experienced a difficult situation from gambling; after all, no gambler is free from loss.
It's true what you said because that's what I feel myself, I had a gambling addiction and it can be said that it was quite severe because my finances were in the middle of nowhere, with the incident that made me lose a lot of money in one gambling that made me realize to improve myself because of my excessive behavior in gambling, this is a valuable experience for myself. I agree with you, it seems like everyone who gambles has experienced difficult situations caused by their own thinking, there will be lessons from that and make us realize.