I specifically wasn't referring to that instance (if anything I'm thinking more of the recent increase in measles outbreaks), I myself don't hold a strong view on COVID vaccinations. The trade-offs, and herd immunity thresholds, are different for different diseases.
Do we know that 0.1% prevalence of "unvaccinated" AI agents won't already be terrible?
Fair enough. I assumed you had Covid in mind with an anti-mask reference. At least in modern history in the US, we have only even considered masks during the Covid response.
I may be out of touch, but I haven't heard about masks for measles, though it does spread through aerosol droplets so that would be a reasonable recommendation.