Anyway I would say that this story is a bit drmatic and I hope it won't happen to any of us. But life is full of obstacles and one cannot always succeed from day one. Moreover, I notices thos guy did not know much about the markets, since he started trading and making money 3 months before the krach and obviuously quit his job during the krach...
Conclusion, trading is a real job and you need to learn the basics before starting to trade seriously. This guy did not apply the basics rules of trading and started trading like a madman since day one.
Once, I met a guy aged 40 during a trading fair and he said to me
I started trading before the krach, made load of money, then I quit my IT job and traded with full leverage all my capital and lost everything in a month.
There is another guy during the same period that made 500% in 3 months during the bullish frenzy and then invested all his gains time 5 on a single stock. He lost everything and had to add from his pocket.
Bear markets are great teachers and very often the same stories repeat themselves. Your friend is no exception and he just made the same mistakes that made million of people and instead of relaxing and trying to understand why he made such mistakes, he preferred to continue....
and as said Jesse livermore : "The game of speculation is the most uniformly fascinating game in the world. But it is not a game for the stupid, the mentally lazy, the man of inferior emotional balance, or for the get-rich-quick adventurer. They will die poor."