I'm honestly of the opinion that all of the ethical questions that arose during this search are fairly minuscule compared to the potential findings that could help us end this never-ending outbreak altogether. (At least by developing better targets for drugs like Paxlovid, if their hypothesis about GI tract replication turns out to be correct.) Of them all the potential to reveal that the patient X is hiding their HI…
There is nothing that can help us "end" the SARS-CoV-2 (COVID-19) outbreak. A highly infectious respiratory virus with multiple animal reservoirs can't be eradicated or even really contained. At this point it's just one more of several endemic human coronaviruses and will always be around in some variants, much like HCoV-OC43.
More information in this case is better outcomes regardless. We can't just accept the current state of affairs and do nothing if there are still avenues of improvement that don't involve pretending like COVID is a mild disease or forcing quarantines whenever some worse variants shows up.
Whether it will jump back from deer or dogs (two animals aside from minks who i remember testing positive for sars-cov-2) back to humans is a huge if (hasn't happened so far as far as I remember, or if it did, it couldn't have been more than ballpark ~5 cases), but I don't disagree that it might happen once more, since I'm not a lab leak guy.