Also, over 1/2 of the poll workers nationwide are over 60.
Scaring them into not working creates a shortage of poll workers.
A shortage of poll workers gives states the excuse to shut down polling locations and nudge everyone into mailing in their ballots.
https://www.nbcnews.com/politics/2020-election/elderly-poll-workers-run-u-s-elections-covid-19-will-n1205761