At one time doctors thought that blood letting was good. Do they still do that in modern medicine? Plenty of people trusted them back then. Doctors are not infallible.
Um, bloodletting is still used. For haemochromatosis, among other things.
It does still bear out the point you are trying to make: at one time doctors thought it was the cure for all sorts of things, then it was derided as no more than superstition, and more recently it has been recognised that it is neither, but has a range of therapeutic applications based on actual science.
The point being that therapeutic decisions should be based on real science, not just on what the majority hold to be true but what experimental evidence demonstrates to be true. Even science can be corrupted of course, by such things as groupthink, money, or fear of being targeted.
At the moment altogether too much of what is going on with COVID doesn't appear to meet that test. We have media and politicians and people with a direct financial stake in particular approaches - perhaps I repeat myself - dominating the discussion, and actively suppressing any challenge to the "accepted wisdom". Any science, or scientist, bucking the dominant narrative is ignored, suppressed, or attacked.
