Can you, with a year-long epidemiological study into the effective ness of masks into preventing diseases passed by aerosol droplets? Because we just ran one of those last year, and the masks came out pretty well. It wasn't just covid19 that was contained, it was also measles, the seasonal flu, etc.I didn't fake the statistics. I can also robustly support my contention that anything other than an N95 mask doesn't do much.
Poorly designed seat belts can cause more injury, and seat belt restrictions have altered over decades to make seat belts better. The same holds for baby car seats and motorcycle helmets.Being that there are no mandates on the certification of masks being used during pandemic spikes like there are on nearly every other mandated safety item (seat belts, baby car seats, motorcycle helmets, etc) it is easy to argue that effectiveness of the safety measure isn't the point.
Unless you are actually breathing in an excessive number of fibers, masks can be more or less efficient, but they don't cause danger in the same way, and we haven't been using them for decades.