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I would blame the gambler for reasons not to have gambled responsibly. That's why gambling is reserved for sensible adults. Those who can say 'No to themselves' and stand by it. Clearly your staff isn't that person and let's greed get the best of him.
He should pay up what he owes, he incurred the debt and is liable to pay.
well, maybe this is one of the mistakes of gamblers, maybe if the gambler has control and responsibility for every bet he makes, it certainly won't be like this. because we know that casino agents only offer something special for their customers and it is only the gambler who must refuse the credit offer.
if the gambler could control himself not to use large sums and control himself not to borrow more than he could, I think everything would be fine.
but nevertheless you said something true that the debt still has to be paid and it has indeed become a valuable lesson for gamblers not to make the same mistake.