Science does not suddenly produce full and complete, totally, one hundred percent accurate explanations of worldy phenomena. Thought experiments lead to reasoning processes which lead to physical experiments which lead to observed results which lead to new questions which lead to new reasoning processes which lead to new physical experiments which lead to new observed results and so on and so on.
In ancient Greece, during the 5th century BCE, Leucippus and his pupil Democritus put forth their idea that matter was made up of "atoms". It took centuries, but in 1913, Niels Bohr and Ernest Rutherford described atoms in terms of a nucleus surrounded by orbiting electrons. As the twentieth century moved on, quantum mechanics re-described atomic structure. Sub-atomic particle physics became a new study area and that work is still going on. Think of CERN.
At no time has any of that work ever been wrong. It was, and still is, merely incomplete. The same points hold for other sciences as well such as astronomy, oceanography, seismology, etc.
The COVID-19 virus seems to be a recent development. Its underlying bio-chemistry is very complex. Virology is a very demanding field of study with a great deal that is admittedly unknown. New discoveries are arising day by day by day including discoveries about various mechanisms of viral transmission.
A couple of months ago, I was reading articles about viral transmission via surfaces. How long would this new virus remain dangerous on a metal surface, a plastic surface, a wood surface, a stone surface, a cloth surface and so forth. I kept seeing new estimates of those times being written up but how accurate those estimates were or were not I could never really deduce.
The next thing I noticed were descriptions of virus transmission by way of droplets being expelled in the breaths of virus positive persons. This seemed to be the primary virus transmission mechanism. Experiments seemed to show droplet dispersals to a distance of approximately three feet so the recommendation was publicized to keep at least six feet away from other people. However, later work added some new information.
In some cases, not all cases but some, much smaller droplets than those already studied could also carry active virus from person to person and do so over distances much greater than six feet by so called airborne transmission. This micro-droplet (my wording) effect is not the primary virus transmission mechanism, but it does seem to occur in some cases and should therefore be guarded against as well. To me, paying attention to this new information calls for nothing more than simple common sense and yet I see this too being disregarded.
As time goes on, more and more things are being learned. Therefore, at any specific time, advice is offered in keeping with the level of knowledge that has been gained up until that time. Because the knowledge base changes, sometimes the advice changes too.
The unfortunate response to that simple reality is some folks saying: "Last month you told me AAAA and then two weeks ago you told me BBBB and now you're telling me CCCC. What you say keeps changing so I don't think you have any idea what you're talking about and I am not going to listen to you!"
The results of such disregard for scientific information are being seen now in some states where Intensive Care Units have been filled up to their maximum capacities with COVID-19 victims and the number of victims is still skyrocketing upward.
Just from today's CNN website alone, look at these headlines:
Shakespeare himself couldn't have come up with worse tragedies.