For an interesting tangentially-related thought, try asking people what the definition of "healthy" is for a human. Mental health is the hardest part to define out of all health.
I would argue that the average human being doesn't consider these things easy to acquire. For society it COULD be easy to distribute these things if we decided that was a goal of ours, but we haven't gotten there yet. I would be very interested in seeing the ideas (or problems?) invented by children born into a world where this was true, but unless things get very interesting very quickly, I doubt we'll get the chance.
Without the immense pressure to conform to insane, abusive and destructive standards in combination with living in a harmful environment with poisonous "food" and "medicine" in competition with others who are likewise fighting to keep their head above water; I suspect most mental illness would disappear by itself.
Treating mental illness like some kind of natural law which can't be avoided, only stops us from finding the real causes and progressing towards a more humane society.
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.
I'm not saying a more humane society would cure existing mental illness, though I'm sure it would help.
The point is that most mental illness is a product of the society we live in, and the long term solution is fixing that rather than medicating the symptoms.
Blaming chaos or genetics, that's how you over-simplify.
Now you seem to be suggesting the conditions are expanding, as if invented, to serve a profit machine.
This all suggests to me that your real opinion is that the illnesses don't exist.
I have seen enough of this up close to know that it isn't society's construct, that many sufferers are objectively having problems.
Maybe not all cases and conditions are like this. But it doesn't do anyone favors to handwave some of those serious conditions away.