[FireBeyond]

Yes, but that's only partially the reason, or rather, in some cases.

In my state, that was specifically to cover "well, if you deny driving the vehicle..." situations, where people would say "Oh, it wasn't me, I lent my car to someone/my kids drove/whatever", and law enforcement replying "Who?" "Oh, I don't know. Sorry."

Now it's to increase the burden of proof. It's reasonable to assume that if you own a vehicle, you were driving it. It's furthermore reasonable to assume that you should be able to identify who was driving the vehicle, from the face, even if you do have multiple people driving.

If you then refuse to identify the person, or "I don't know", then it's tantamount (in the law's eyes) to saying you weren't taking due regard to the care of operation of your vehicle (after all, if you don't even know their name, how do you know they're licensed?).

[manfredo]

The assumption that the owner of a piece of equipment (be it cars or computers)know is always responsible for how it is used is not valid. Cars are stolen with significant frequency, for example. People also drive them without permission (e.g. a spouse gives the keys to a visiting in-law). There are plenty of situations where somebody may not be able to identify who was using the car.

Computer crimes are the same way. It may be possible to prove what equipment it's implicated in a crime, but that's rarely sufficient to make any individual responsible without other evidence. People give WiFi passwords to their guests, equipment is hacked, etc. Establishing that an owner of a router or computer is responsible for anything it is used for unless proven otherwise opens a massive attack surface for blackmail, extortion, etc.

[FireBeyond]

Of course.

> 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".