Not all would, but if I were witness to an incident I would stand by what I saw. I am principled like that.Many don’t realise that if they submit videos of “bad” driving via the public portal to the police they may be called upon to act as a witness. This means giving a statement and if a case is pursued could in some circumstances be required to attend a court hearing.
I once saw a car stopped at lights to turn right. A lorry pulled up inside of him. I was behind. The lorry driver got out and went to the elderly car driver who opened his window. Nothing was said, but the lorry driver simply punched the car driver. I wanted to get out, but the wife would not hear of it. But a lorry driver coming the other way came over and settled the situation.
I can only guess that the car had cut the lorry up further up the road. I saw the lorry turn into a depot just half a mile further.
I called the police with the details and numbers. I was asked if I would be prepared to be a witness in court. I said a definite yes. They told me that most people would not.
I did not hear anything further.
John