> Cars are stolen with significant frequency, for example.
Presumably you'd report your car stolen, no?
> People also drive them without permission (e.g. a spouse gives the keys to a visiting in-law).
Then you'll be able to identify the person via a picture of their face, most likely, no?
> Establishing that an owner of a router or computer is responsible for anything it is used for unless proven otherwise
I'm not trying to say any different, in fact I'm saying that it is a "reasonable" assumption, and as with any reasonable assumption there are notable exceptions, by which showing the driver's face is a reasonable method by which saying "No, Your Honor, the person driving my vehicle is not me". In some states you may not even be obliged to identify the driver, only show that it "is not you".
> Cars are stolen with significant frequency, for example.
Presumably you'd report your car stolen, no?
> People also drive them without permission (e.g. a spouse gives the keys to a visiting in-law).
Then you'll be able to identify the person via a picture of their face, most likely, no?
> Establishing that an owner of a router or computer is responsible for anything it is used for unless proven otherwise
I'm not trying to say any different, in fact I'm saying that it is a "reasonable" assumption, and as with any reasonable assumption there are notable exceptions, by which showing the driver's face is a reasonable method by which saying "No, Your Honor, the person driving my vehicle is not me". In some states you may not even be obliged to identify the driver, only show that it "is not you".