There's never been a question about medical settings.
Also, let's assume the facts are that masks are 5-10% effective in protecting the wearer. The phrases "masks can protect you" or "masks have little effect in protecting you" are both true from a scientific point of view, agree? I don't think it's a good idea to push fake statistics or cherry-pick studies, but I do prefer the former phrasing from a political and humanitarian point of view.
EDIT: former, not latter :)
We should never encourage lying or deceiving people (pushing not technically true narratives). This just erodes trust in society.
Tell the damn truth. If something is uncertain, tell the damn truth about how uncertain it is.