It makes sense that this way of thinking about things would be a natural inclination for you, so I can totally believe it was genuine curiosity.
I think you may dramatically underestimate the extent to which drugs are used for non-specific effects in medicine in general, and also the extent to which formal diagnostic procedures guide medical decision-making on a day to day basis, even in specialties that routinely have objective laboratory measures and imaging. While often able to supply explicit reasons when called upon later to do so, the literature on clinical judgement in medicine at least suggests that pattern-matching and impressions of a gestalt are much more important and dominate the process. Medical testing is often informative but not dispositive; the mapping from a particular pattern of results to a 100% clear diagnosis is fairly rare. This is discussed widely in academic journals and in more applied settings intended to train medical clinicians. I have a very hard time imagining how discussing it on an Internet forum would put someone in legal jeopardy given the utterly pervasive and uncontroversial nature of this idea.
I agree with you that "I gave a benzo because it was a good idea" by itself is inadequate, but if you word that differently and offer really any meaningful attempt at justification, aren't you describing clinical judgement?
It is not uncommon for people outside of medicine to have an idea of precision and formal rigor that is very unrepresentative of clinical practice. Physicians are mostly not logicking their way through their day, but drawing upon schemas and prototypes induced over thousands of repetitions of patient encounters and performing something more like a fitting procedure. It is really only when this fails or is obviously inadequate that you start seeing explicit reasoning begin.
I personally would say that the nature of mental "disorders", whatever that means, is such that this sort of non-explicit reasoning is always going to be inescapable in psychiatry to a greater extent than other fields, but again, a different tangent.
It is interesting to me that so many people here, I think, perceived hostility in what you were saying that you say you had no awareness of intending. Whether that says more about us or about you is obviously an open question, but for my own part it is a vibe I have gotten from previous posts of yours, so I think the explanation is something more than sensitivities about this specific, particular topic per se.