Those types of traders should not be trading...they shouldn't even have a trading account. In fact, they shouldn't even be hanging out at trading forums or anything to do with trading.
Most folks in situations like that just get a job when they run out of money but there are a few in past news that did exactly what you stated and in those stories...they had other issues not related to trading that was extremely problematic.
Simply, if you don't have a healthy mind...it doesn't matter if you're a trader or a dentist or a police officer or a real estate agent or a soldier that has returned home from combat....your risk of suicide increases when the economy goes southward or when you have financial crisis.
The problem is money itself...many in the world attach their identity or worth to money.