Lefties need to lay off the pot and jump in the sack or the MAGAs will outbreed them.

A scan of the paper seems to show that they don't consider the confounding influence of urban density. Humans don't seem to have innate "quorum sensing" the way bacteria do, but expensive housing is likely to have something to do with it

https://www.pacificresearch.org/housing-costs-drove-the-majo...

not to mention the perception (if not reality) of an unsafe environment

https://ideas.repec.org/a/ebl/ecbull/eb-25-00236.html

and between leftists dogpiling in big cities where their votes don't count and those cities making it close to impossible to build housing that has to be a factor, together with individualism, anti-natalism, etc.