There are idiots out there when a government says anything, they think its a bloody conspiracy, they could tell them the grass is green and they'd argue the toss, blame the Russians or come out with some shiz about how the grass is only green because of something being put in the water or chemtrails or some such rubbish..
As for masks not working, look at the far east, they wear masks when they get ill, or just in general, have done since the Spanish Flu, must be a reason for that eh...