In the first place is it his money?, why won't he be at fault ,If he was a good citizen the rightful thing he should have done is to return the money, the money that was sent wrongly to his account, he went futher and used the money for gambling. maybe he was aiming at winning a jackpot and then pay back the money. So in all and sundry he's at fault and not the sender.
I think he is not story for using up this fund. He became greedy and would have wanted to double his before he would distribute among the people.
When you get funds/money you get the idea what other person is up to .. People become blind when they get others people money and they keep running when they have to return the money.