My theory is that unhappiness is not all the various factors other people are talking about, not fundamentally: not money, not neighborhood design, not living in the city vs. living in the country -- its a deeper spiritual problem.

If you really want to understand something you need to integrate all the evidence, of course, and not just the parts that support the easy conclusion.

It's under-discussed, because we, the technocratic class, have no tools to measure it and not much language to talk about it.