Some of what you say here is true but that doesnt mean gambling will ruin your life. If you have an addictive personality and cannot control when to stop gambling, then yes you prob shouldnt gamble. If you have self control and just wanna toss a few dollars around here n there then youll be fine.
Well, about your statement true that gambling can't ruin your life, but gambling can be a tools to ruin our lives when we become a very addicted in gambling or it will become one of our vices, if that happen it would be hard for us to quit, it takes time before we totally surrender it fully, it will really take on due process.