Comment: The distancing is a controversial issue. We cannot deny that the closer you are to the infected person, the greater the risk of transmission. So, any rule that regulates the distance is better than nothing, even though ventilation of indoor spaces would work better.
They have probably made a compromise between the large droplets (distributed when somebody sneezes or coughs) and the aerosol (distributed with normal breething). Large droplets travel in the air about 1 meter from the source and then fall to the ground due to gravity. Aerosol floats in the air 30 feet or more. They could not implement a 30 ft distancing rule, it would not be practically possible in a grocery store or a pharmacy or other public places. So, they doubled the 1m distance and that became the rule. It made some sense, even though it was not based on peer-reviewed science published by a reputable medical journal.
Much more unreasonable was the requirement to wear masks that, even when worn properly, were completely inefective against airborn respiratory viruses that mainly spread with aerosol. Plus, masks were causing other infections, as the moist and warm inside surface of a mask is a perfect breeding ground for previously exhaled bacteria and fungi. Not to mention a high concentration of own viruses, bacteria and fungi inside the mask that many people were dutifully re-inhaling daily for hours.