I got the information that Yeadon provided and it makes sense from virologist point of view, but he hasn't completely taken into account of social transmissions in an active populated environment, sometimes those which are quite dense, such as New York city, Toronto Ontario.
To suggest that governments are trying to redundantly and inappropriately impose fear by lock downs, social restrictions and mask wearing is really missing both the intent and point.
To really understand how this virus transmits to another person you really have to study how its capable in doing so, it could happen by friend visiting or stranger who thinks they just have a cold coughing behind you at a drug store.
Social distancing and mask wearing helped in slowing down the transmission of the virus, many who would have gotten through it but many would have also ended up in the ICU ward at your local Hospital.