No. If it becomes the assumed answer, nothing else will ever better explain it. You're always going to assume that you are already correct. Only by not assuming the answer do you continue to question the theory when new circumstances come up
Yeah, but it is okay (in fact, generally necessary) to do that until you have evidence or reason to do otherwise.
I mean, right now, there's this assumption that Covid-19 came from the wild. Some folks question that. Maybe they'll find evidence that it was from a lab, and
that will become the assumption. By your logic we must spend effort questioning that, because "irrefutable proof" does not exist in the scientific world. Lather, rinse, repeat, and the investigation into where it came from
never ends, because whatever the solution of the moment is assumed must be questioned.
Thus, this argument is not practical - it is an endless, unproductive loop. We cannot spend all our time questioning each and every thing we already think we know. At some point, we have to move on, and wait for a reason or evidence to question.
Since we have all this new evidence, the theory needs to be questioned for this pandemic to see if there is a better explanation.
The question of where it come from is primarily a
quest for blame. Assigning blame will not lead to better health outcomes for the populace at this point. Assigning blame will not correct economic dislocations that have occurred - indeed, the search for blame can easily worsen economic impacts if it increases international tensions.
It took
years after the original SARS crisis before they found the likely source of the virus. If we ever do find the source of SARS-COV-2, we should expect it to take similar amounts of time, no matter if it were natural or engineered.