Some of the people got in their car after they already wearing their masks. They just might not want to touch them with with bare hands and put on more hand sanitizer.
Also put their masks anywhere in the car (beside hanging on the mirror) may contaminate the surface where masks touch.
Yeah fair enough i suppose but that still sounds quite unnecessary to be honest.
I guess i just dont believe it is actually possible to contract the virus in this situation...!
Peace, Graham.