I would say that in the U.S., since a trillion plus dollars was spent to buy these vaccines as an "emergency measure" that we have to continue to believe that there were no effective treatments available to justify the emergency spending. Think about that emergency situation. Our all knowing government can piss a trillion plus of our taxes away, without any congressional voting or anything like that under "emergency" labeling.
That's musket grabbing taxation without representation stuff, so yeah, we can't allow anyone to believe this wasn't an emergency and that there were safe and effective treatments available.