Do you really think drones would be wearing masks all the time if they were useless?
Masks do jack shit. The most significant benefit of them is getting people not to touch their filthy mouths all the time and spit when they talk. It does next to nothing at filtering out viruses which are on average 50 time smaller than the individual hole in the filters on masks.
It's a programming tool to give the illusion of safety and to control retards and their behaviour. And this isn't a fucking bad thing either. The annoying part are the people who jump to protect their inflated ego because they must believe masks work or otherwise they are wrong, and their whole lack of a moral structure falls apart due to them only mimicking their character based on authority figures.