I have read many news that someone will mismanage people's money. I read one about a university student some years ago that gambled with the money contributed by his course mates. The main reason that is causing the money mismanagement is either trading or gambling, but I read more about gambling online. Some can be because of other reasons.
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Once a gambler already experience how to win a large amount in playing gambling they will think that they can do the same thing again and again, and of the factor they need of course is budget seems base on the story nothing else other way to accumulate money as he can and by that doing so he think he can risk a large amount of money to have a huge return and bring back their money once he make a good gain, but the opposite things happen he lose all of their money and now he cant deal with his mistake, this kind of story seems can be more because of too much addiction to earn more money in an instant way. Always gamble what you can afford so you don't get include other people with your mistakes.