There is harm to a patient if you tell them an incorrect test result.
> we should [not] be ... trading insults.
A backhanded compliment is a form of insult, friend. I don't think this kind of ad hominem attack is substantially responsive to my remarks.
Your use of "my friend" is similar to the thing you're complaining about. I got what you mean. Bringing up "ad hominem" is dodging the real issue.
Another comment of yours: "utterly stupid bureaucracy"
If you have a false negative, then maybe they spread the disease more than they might have otherwise (unwittingly, but now with the “certainty” they don’t have it).
If you have a false positive, the main downside is from people who think “great, I’ve had it / got it, I’ll be immune shortly”. So that’s the main risk to them.
The false negative hypothesis is facile; even if you don't have it, you can still get it. Ignoring social distancing on that basis wouldn't be any more sensible than doing so without the test. To the extent that some people are just idiots, a false negative diagnosis does not change that.
I have noticed that your comment is quite typical for people who want to say that we live in a post-truth world. There are certainly problems, but one solution is to double down on science.