Mental health. What is its importance now?

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Mental health. What is its importance now?
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• A friend of mine who was pursuing Masters in
  Biophysics suddenly began to feel disinterested
  in the world around him. He remained absent quite
  often and most of the time locked himself in the
  room. He didnt feel like talking to anyone,
  didnt care for his grooming, and was began to
  feel worthless. 

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• Fortunately, his father noticed the symptom and
  took him to a Psychiatrist. Diagnosed with
  depression he was immediately put under
  medication. But, most of us are not that
  fortunate.

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• Its not uncommon to find the news regarding some
  Bollywood actor/actress committed suicide. While
  suicide is not confined to the film fraternity,
  it is a common phenomenon cutting across
  different professions. Even the people who look
  fairly well and owns better means of income also
  resort to this drastic step. It seems evident the
  question here is what thought process they are
  going through and what made them do that?