We're glad that there were gamblers before who took risks and suffered losses. They are now our tool for learning, and yes, because of them, we change. However, this won't make everyone pleased to change their behavior and thinking. Many still live in greed and stupidity. That is why we don't wonder if gamblers have fallen into addiction, committed huge debts, etc…they never realized the situation yet.
What saves us from doing stupid things is to learn from our mistakes. If this makes it difficult, I don't know how gambling ruins our lives.