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Chalfie-
Believe themselves to be protected / protecting others.
This. Risk compensation is just one of many aspects the mask debate shares with the bicycle helmet debate. Shifting the burden of proof was already mentioned. Also, rotational injuries with helmets and lack of training, fitting and discipline with masks are just ignored. I keep seeing people grip their mask by the front (where the droplets are) in order to lift it up on to their forehead and scratch their face.
Petteri
Well, there's a big 'maybe' on this. Nobody really knows. Grasping my £10 rock (fnar) or donning Dan's tinfoil hat might be equally (in)effective.
The bigger problem is that people will not do this, they will buy up N95s that others should be using.