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.
Right, he is very young that's why he can't take seeing his balance going negative. I'm sure he might know the risk, but perhaps he reacted the wrong way and yes, the failure of robinhood to clear about those balances reflecting on your account. I agree on what @tbterryboy teaching our children at a young age about economics, I think a simply savings will be good for young kids specially today.