Mental illness is very real and can be just as devastating (if not more) than cancer or heart disease. Where a cancer victim's loved one will likely draw for support a man clinically depressed is more likely to be or feel alone. Depression can cost people their jobs, families and yes, their lives. Depression can last for years and even decades. Shame at themselves for feeling this way leads many men (less so women) to never seek proper treatment. After all they are just being "sad sacks".
Attitudes like yours lead sick people to needless deaths for a treatable, or at least manageable, condition.