When you exhale, on the other hand, you create positive pressure which violently expels the droplets regardless of what's in the way. This creates droplets with high velocity and turbulent flows within the mask that prevent them from traveling a straight path through the mask and cause most of them to collide with the fabric.

Basically, once it's exhaled it's a hazard to anyone who doesn't have a properly fitted N95/100 mask (which requires specialized equipment, though it's relatively common)

I remember as an OTR driver the truckstop bathrooms I survived each day. The olfactory violence was palpable enough to feel it crawling through the mask and see it grinning as it coursed through what must have been an unusual ratio of gas to air. I'd think to myself in that sometimes surreal environment where photons seemed to sweat and stagger, that even an n95 was pointless, perhaps life itself. If rona be here, every particle is riding a pale horse in a hazmat suit. I'll always consider myself a permanent petri dish for that.

I'd be all for mandatory toilet skirts.

That's how we end up with a calculus that determines that impinging individual liberty (requiring masks) has a net benefit (limiting overall community spread).

I guess a similar analogy might be: driving half the speed limit might in a weird sense feel like you're protecting yourself from harm in an accidental if else someone drives too fast, but the better policy would be that both directions of traffic maintain speed at or under the limits. Again, this is an instance where we limit individual freedoms when there is a perceived net benefit to community safety.

this minutephysics video might answer your question

Thank you

wearing two masks instead of one wouldn’t make things worse, though. but better? again, good question.