Earlier quoted context omitted.
The virus isn't going away. No matter what you do with masks and other measures you'll eventually be exposed. The most you can do is delay it a bit. https://www.medpagetoday.com/opinion/vinay-prasad/94646
Even if it's true that infection is inevitable (it's not true), delaying infection is a good idea, to reduce the immediate strain on the hospital system.
Those staffing shortages are in turn caused by strict quarantines for people who are asymptomatic but test positive.
https://www.sfgate.com/bayarea/article/COVID-San-Francisco-s...