It is also said that a person loses their ability to think or understand anything 15 minutes before they commit suicide, which is why nothing comes in front of them once they have made their mind, and they do it without having any mercy on themselves and on the ones that love them because a sane person would always think about their family before they take such an extreme step.
The only thing to prevent them is if someone had. But clearly he was alone in time of doing that no one could have helped.
Unfortunately, people end it like that, they are cowardly and weak. Brave minds will do otherwise and we've seen those in the worst financial mess bouncing back to be better, how would they know that if they never gave it a try but ended it all?
There is no reason whatsoever to justify suicide, which is more reason we should guard our mental health seriously. The moment we are having bad thoughts is the moment we should fight it, try to build a stronger mind, tell people around us and find professional help, if possible.