I have not responded to this thread before now, but will today from three angles. 1 from a police perspective, one from a driving instructors perspective and one from a level headed member of the public.
Because of my military, police and driving instructor training, I am one of those that actually does a full inspection of my own car every day. It takes me 5 minutes to visually walk around the car in the morning checking all lights, followed by recording the tyre depth for each tyre and the pressure of each too. I also chcek oil, water and washer fluids. It is in my interest because of my job not to have a defective car, but it is equally for my own economic driving, safety and reassurenace that everything is ok. How many times have you run out of washer fluid on a motorway JUST when you really need it?
Would I expect everyone to do the same? No. Of course not. But a simple weekly check of the same level would avoid this and many similar situations arising. Having said that, how do we know this driver didn't have their good wheels swapped by a criminal who had bald tyres? Assumption is always a problem, so even though the likelihood is that the driver/owner must be accountable, unless they actually drive it on the public highway in that condition, no offence has been commited. If they had checked their tyres that morning and someone had changed them, would they be aware? I don't recheck my tyres after I buy the morning paper or before I drive home again at night, other than a quick glance for flat tyres or car park damage.
For all we know, they were aware and had put an old wheel on and taken a taxi to get a replacement!
As a driving instructor I can tell you a little more about the show me - tell me situation. Even if a pupil gets both questions completely wrong, eg 'I don't know and I don't care either' type atitude, they will not fail the test on that basis alone. The can pick up a maximum of one driver fault for that and unless they get another 14 on their test, or a serious/dangerous fault, they can still pass. So, the element is worthless in that respect. Plus pupils learning where the oil goes on their instructors Corsa will not help when they buy a Fiesta. Most teenagers are too lazy to ever bother with such trivia anyway. (I know, I have two!)
From a sensible member of the public perspective, I would have left a note on the windscreen advising the owner of the illegal and dangerous tyre and left it at that.
A police officer would not do that (other hat). One would have to speak with the owner once aware. Imagaine the scenario of doing nothing and this vehicle then being involved in a fatal RTC. When you can make a difference you should. It doesn't have to be a penalty and peoples reactions will often tell you they were unaware and will do something immediately. The owner was probably blissfully unaware. Some will take the note, think OMG! and go straight to kWIK fit or similar. Others will discard it with a calous 'MYOB' attitude. We will not know which until it happens.
However, what I would not do in any capacity is tell the headmaster. That then becomes involving a party who has no actual need to be involved. It could only serve to cause trouble. Yes, the driver should be aware, but a note would do that. What is the point of potentially causing them problems at work?
Soapbox away. Waiting for flack......