Syag,
I am not against asking shailos. I was pointing areas where I think it is important to ask them.
Next you complain that I talk about what works for me. If I posted something that you think could not work, I am simply inviting you and others to think how to apply my experience to better yours.
Re: minyanim. First, evidence that religious communities have large numbers is large. See Israeli numbers. Do people get sick in a minyan or a kiddush after that, or a yeshiva or a store nearby, is hard to say. There is a lot of general evidence that larger unprotected gatherings are more dangerous. Would you claim that covid does churches and not shuls?
The way you describe your community points that minyanim did propagate covid (you mention that it went thru multiple people in same shuls). you also mention that maskless got it earlier – this means that maskless had higher probability. It also points out that your masked minyanim were also not safe. It is, again, your fault. I posted recommendations here months ago how to make it safer. You should have advised those minyanim on safety measures. If you did, and they did not listen, then it is not your fault. My experience is 2 out of 3 who followed some of my recommendations. Even 3rd adopted some minimal ones.
If you were not sure, whether it was your business to go and tell them – you should have asked a shailah. You still can. Let us know what your posek says – are we arevim zeb’ze or not in this case?