I'm of the opinion that the number of people out there who are either being treated for a mental health disorder or in need of treatment, is staggering.
I firmly believe that for many people, life is like walking a tightrope, but even their closest loved ones have no idea that they even have a problem because there is such a stigma associated with depression/anxiety, etc., and a fear that if found out, it could damage their relationships and career.
I also think the stigma is compounded for men, and in particular, men in vocations that are dominated by men (sport, public safety, building trades, military, etc.)
At the end of the day, the people that know us best are ourselves, and if Gary Speed did kill himself, then he was clearly grappling with problems for a long time, and they became insufferable. I wonder if he was in treatment. But I'm guessing he wasn't.
Hopefully the high profile nature of this case brings the discussion forward for more people.