This is a prime example of not weighing out the risks. Leverage in trading works in both ways, so if you're prepared to go all in without even being bothered about the consequences well I'd say that's complete foolishness. No amount of money is worth a life.
There was no risk at the moment he killed himself. He was fine and his balance was positive. It was a misunderstanding on his part and a failure of the site to make things clear enough.