Is it a “sad” subject? Or is it a cultural adaptation to scarcity and tough circumstances? Nobody cares about your emotional health in the Bangladeshi village my dad is from. Would the village function better if they sat around talking about their feelings like white people?
You need medication to meaningfully address those major conditions, which most people in the developing world don’t have. Even there it seems like the reaction of people in the Philippines (to ostracize people with those conditions to avoid them becoming a burden to thecommunity) is a rational adaptation to their circumstances.