You are 100% right and one of the few who recognize that.The 6 foot distance is arbitrary . It does not take into consideration air currents, which can carry an infectious aerosol for two or three times that distance. Thus don't think one is safe once the 6 foot distance is maintained. Sure, six feet is safer than 4 feet, and 10 feet is safer than 6 feet, etc. The line from your living room to the nearest person outside your residence is probably the safest distance to maintain. Stay home unless absolutely necessary.
The virus can be airborne, I don't think there is any safe distance in an enclosed facility like a grocery store or multi residency buildings due to air current from HVAC. All the advanced countries have 100 to 200 times the infection rates compared to all the underdeveloped countries which have very few HVAC systems.
I wrote a 7-page article report explaining this and tried to send it to the powers there are but they do not accept any communication. They have their blinders on and cannot see the forest for the trees. The article is uploaded on my google drive. You can access it with this link. There is a separate folder for references.