I think you're right that there are social, societal, and stress-related causes of many of these conditions that are under-explored. And certainly the cultural attitudes need to be adjusted more towards compassionate acceptance and helping others than they are today.
However, when it comes to an individual person being stuck in one of those states... What you are saying winds up feeling a tad ridiculous. For example, if presented with someone who has a delusional belief in something objectively, demonstrably false on a factual basis, to the point where acting on their belief makes them a danger to themselves or others ... It is not the case that a different society will make those delusions into true facts. What they need in that moment is probably medication. I have seen people for whom that has definitely been the case, and they show improvement with treatment.