Earlier quoted context omitted.
The anti mask, anti N95 masks with exhalation valve stuff has been the worst here I think. If you would let folks wear N95 with exhalation valves (highly comfortable) it just makes it easier for folks to protect themselves (and indirectly others). And for those who don't care, let's distinguish slightly between making sure those who want to protect themselves as much as possible can, and the need to force people down…
I don't get it. Exhalation valves are great if you're using the mask to filter external dust. Here you're trying to filter outgoing and ingoing droplets. Filtering is still going to be most effective at the source, even if you are wearing N.95. Adding a valve is going to reduce the utility of the mask a lot for this application.
On egress, just a quick look at the valve, it's going to stop the velocity and either block or drop particles - however ineffective that might be on egress there is NO WAY it is worse then what I see others wearing (surgical / thin cloth etc), mask off the nose, mask off while they eat etc.
Finally - folks historically have a natural "self interest" motivation. Ie, if you let folks act in a self interested way - personal protection, personal comfort - you are likely going to be better off policy wise.