see attached
I don't know who wrote what you posted, but his "tzu shtels" have no shaychus. In Halichos Shlomo he is saying that when Chazal were originally mesaken a mitzvah, they wanted to be mesaken it it in a way which there would not even be the smallest chance of a sakana can out of their Mitzva. Here we are talking after the fact, when we already have the Mitzva. That is where the K'sav Sofer comes in. Once we have the Mitzvah, there is more of a shemira when doing the Mitzvah than there is when shopping. A small minute chance of danger is always around when going to shul. There are always germs floating around. There is always a danger driving in the streets or walking across the streets. But when the chashash reaches a certain level, it's not considered sakanah anymore. That is when shomer pesayim kicks in.
Where we are holding now, it is far more dangerous to smoke or vape then it is to even daven in a shul with proper precautions. And certainly to daven outside.
To answer the question why people shop and go out for other things, but not to daven with a minyan is simple. People really know it's not all that dangerous at this point when the proper precautions are taken.
It is true, some of the Rabonim will also tell you not to go shopping or to go out at all. But most of us are not conducting ourselves that way. There is a reason why the streets are a lot more full now than they were two weeks ago.
Also, if you have the anitbodies, the chances of getting it again are so minimal (according to Dr. Fauci), it's hard to imagine that is called sakanah. And even if you would maybe maybe maybe possibly get it again, it would probably only be as severe as it was the first time. For most of us the effects were minimal, not a danger at all.