For 4 weeks I have been learning in a packed beis medrash. Not one person wears a mask. One person was wearing one and I assumed eventually he would take it off. He still comes wearing a mask! The only reason I can think of is that he wears it because it's government mandated. Does that make sense to anyone using their brain?
On a side note where does that play a role in חובת השתדלות?