A huge number of Americans cannot stay home and are not healthcare workers. People have bills to pay, and not every non-healthcare business is closed, unfortunately.
It's unfortunate because these people are having to put their lives at risk, unexpectedly. They didn't ask to be on the frontlines. In addition, many of them haven't been able to get hazard pay or adequate sick pay.
And some of them (especially within those fields) may be forced by their employer to work part-time and not be eligible for employer sponsored health insurance.