there's an obvious correlation between population density and civic honesty (as well as pretty much every other QOL metric)

I have to ask which way, because China and Poland have roughly the same population densities but are on other ends of the scale.

The Asian countries score high on these (Japan isn't listed in the table but would have been high). That sort of makes this conclusion not fact-supported.

Why would that be? And do you have any data about this?