[majormajor]

The Iceland data is interesting and "14-day incidence per 100.000 by age and vaccination status" is different from the California data, where case rate per 100K is still, as of 12/26 numbers, much higher among unvaccinated (no breakdown for 2vax vs 2vax+booster). https://covid19.ca.gov/state-dashboard/#postvax-status

Iceland also has a higher vaccination rate, I would be very interested in demographic breakdowns of the unvaccinated there vs in California. Is the Iceland group much more atypical in terms of how often they leave their house, say? Is the California group possibly just much more boosted (the Iceland numbers show that the boosted group has still less Covid than the unvaccinated group stil) - but actually, that doesn't seem like it, because that ratio is still far higher than the CA one. Though... even your own link for data on boosted adults in Iceland contradicts your "not even a little" statement.

Actually I bet it's just a small number problem. Iceland has a population of 366K. 8% of that population is just under 30K. California has a population of over 39 million. Much more significant sample for unvaccinated people in CA.