Couple of other things not necessarily mentioned.
If your car is not running and it were to come out of park (automatic) and into anything but neutral, the running engine practically guarantees that you are going to rip the hose, which will spill lots of gasoline.
Also, the rule have to be there for everyone. You mentioned that other cars next to your in several of your replies. Imagine you pulled into a gas station and forgot which side of the car the gas door is located on, but no biggie because the pump has a really long hose (like CostCo), and you are filling up your car and a hot rod enthusiast pulls up next to you at the pump so their hood is relatively close to where you are standing, and they have their car running and the driver is pumping gas, and the passenger opens the hood to check the oil. Would you be more or less likely to wish their engine were shut off? Would it make you feel safer if they rev up the engine several times because they thought they hard someting?
Same thing with an engine backfiring (on the car in front of you), is it common? No. But can it happen if the car is running? Also no.
Same thing with a motorcycle with exposed and hot exhaust pipes.
Car are so much safer than they used to be. The risks are much smaller, but the risks are still there.
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