Some reports have even made claims that after 20 minutes of wearing a mask, because of the vapor of our breaths on the cloth of the facemask, the effectiveness of the mask to stop particles of the size of covid makes the mask next to useless.
Face shields, the air you breath in has no filter at all. It is only your breath hitting the shield, which does not stop all particles from escaping.
Do masks help? Yes.
Are they 100% effective? No. Not even close.
Having people become insane when someone does not have a mask on… that is a brainwashed/cult mentality.
Some people (for medical reasons) CANNOT wear a mask. And they will react the same.
Like in days of old, they yell “LEPER! Unclean!”
This is a modern-day version of the same hysteria.