Danish mask study finds "no clear evidence" that wearing masks protect wearer from catching Covid 19 (Or anything else for that matter):
A major Danish study has found face masks give no clear protection from Covid-19 infection to the wearer, but did not examine whether the wearer protects others by using the item.
TheLocal
Wearing a mask is an article of faith, not science.
1) Even if they provide no protection for the wearer they should be mandated because it is very clear they provide protection for society. Those who won't protect their society should be encouraged to leave said society.
2) The good masks definitely protect the wearer also.