Perhaps the unvaccinated people in low-vaccination countries are unvaccinated due to low vaccine supply, and thus take non-pharmaceutical interventions (NPI: ma

Perhaps the unvaccinated people in low-vaccination countries are unvaccinated due to low vaccine supply, and thus take non-pharmaceutical interventions (NPI: masks, social distancing) seriously, while the holdouts in high-vaccine countries have opted out by choice and belligerently disregard NPI, causing the disease to run wild through their communities.