Stating your rationale doesn't mean your rationale is backed up with evidence.
Again, top public health officials need to be held to a higher standard. That means understanding how populations behave, not just understanding the medicine. That means consistent messaging. The message throughout should've been:
> This is a dangerous virus, and the best way not to get it is to avoid contact with any other people at all. However, if you absolutely need to come into contact with other individuals, risk can be reduced if everyone is wearing a mask. Masks are not anywhere near 100% effective, but they do help, which is why you should be avoiding human contact and only be going out with a mask if absolutely necessary.