“There is less flu and common cold now, so there is a high chance this is Covid”
So…actually false. There are three different cold virus circulating hete and in some other cities as well. One is a lot of coughing and laryngitis, other 2 so closely resemble covid…but aren’t. And guess how i know. Because people who had it tested negative for covid. Do i know you can’t shake that belief that some communities are just ignorant super spreaders but you ate creating and perpetuating machlokis.
And most people can expect that someone with a cold, not covid or flu, will most probably show up to shul, cough and all, while hopefully being cautious about it.
“even if are sure, you should not go out of moris ayn and hillul Hashem you will create.”
So here’s the thing. Mares ayin and chilul Hashem have specific halachik criteria. You seem to use those terms loosrly to mean, “something that makes religious people look bad” that isn’t how it works. In that same way you can’t create your own definition of hakaras hatov, tircha for the tzibur, tzedaka or kindness based on feelings. There are halachas defining these terms.