My considered opinion is the following:
(i) I completely agree that our way of living is conducive to mental disorders, on many levels, in many different ways. Many diagnoses of depression are incorrect. In fact, the people involved just feel objectively miserable about their circumstances and about the way the world is (even if they don't consciously and objectively understand it).
(ii) Many / some psychological conditions conditions contained in the
DSM-IV are completely erroneous.
(iii) If the nature of society and culture were healthier there would definitely be substantially less mental disorders. This need not involve tropical islands and Playboy bunnies, it could just be a more collaborative, tolerant and co-operative society that was less atomised and materialistic. Actually, most psychological studies have found that there is a minimal correlation between material wealth in the Western sense and happiness, or at least perceived happiness.
(iv) Even if you lived in an absolutely perfect utopia, many people would still suffer from clinical depression as there is strong evidence that it is related to brain functionality and structure. Without doubt the reaction between genes and environment (often referred to as '
epigenesis') can have a positive or negative effect on this, so living circumstances can affect it, but you will always have people with clinical depression. It existed long before we even begun to understand it, there are notable historical examples including Vincent van Gogh.
(v) If you looked at a population of, for example, Tibetan hill villagers there would be less incidences of unhappiness and misery because the way they live is closer to our real nature that the way we now live in the West. However, there would still be people there that suffered from depression, what would differ would be that they would (i) feel that they had a real purpose, (ii) have the direct support of a community.
(vi) I'm not sure about a correlation between conspiracy forums and depression, but I don't think 'happiness' is an appropriate state of mind at this point in time, anyway. I'm not happy about the state of the world, about all the suffering and misery and poverty and needless slaughter that takes place. I'm not happy about the fact that people don't care. Maybe I can't change that, but I'm not just going to reconcile myself to it because very little about the world in which we live is either natural, necessary or unavoidable.