Why not try to find the root cause here first. Where were the parents when their 16 years old son was addicted to gambling ? They should have monitored his activities and this situation would not have raised. You cannot blame the doctors on insufficient medical treatments when the son could have be taught at home to avoid excessive gambling. I would consider it a negligence on parents behalf as it was their first duty to keep an eye on their children.
At some point the individual has to bear some responsibility. Sure, gambling away all your money is a bad thing, but I'm sure the kid did it thinking he was going to get rich or something. There are just no shortcuts to wealth unfortunately. Those who try, whether that be from gambling, prostitution, selling drugs, or various other crimes, are usually disappointed. I think trying to find someone to blame isn't always the most beneficial thing. Maybe it was his teacher, parents, friends, or some advertising campaign that led to this problem. Who knows? One thing I do know is that resisting temptation is part of the human experience. Those who fail are often left with consequences from their actions. Sometimes the blame falls on the individual.