Justifying their behaviour with 'addiction' makes them completely unresponsible for their actions. If that's the case you'd have to declare them incompetent for doing business and assign them an agent.
This isn’t just gambler vs some other person.
This is one person against a resource pool worth millions of dollars. No individual in aggregate has a chance against that.
This is generational wealth that gets lost in gambling. It is the responsibility of a strong society to prevent scams, and to protect people from very damaging forms of manipulation.
Because when a fool is parted from his money he and those who depend on him starve to death, and that, dear friend, is the part a strong society should be concerned about.
Just like if you fall victim to a phone scam, sure it's somewhat your fault, but clearly it's mainly the fault of the scammer.