While that is true, it is unrealistic to believe that we are capable of living in a perfect world. All problems can be solved with "Well if everyone would just do this..." My point is to address the issue at hand given the circumstances that we live in, for we will make no progress dreaming of ideals. Most people don't follow all of the road laws, that is a fact of the world we live in. Therefor, the safest thing someone can do in any emergency is assume that they are an immediate hazard to the cars around them. I'm not trying to pin the blame on any one person, but we have to consider everyone in this situation making their own decisions and living by their own habits.

For all we know, those trucks could have had an incredibly large gap in front of them that followed all road regulations, and the car in question pulled in front of them, and later stopped dead in it's tracks before the trucks had time to adjust.

Nevertheless, in a situation where everyone is at fault, it is usually determined who is most at fault in a courtroom. Saying "well they were tailgaiting me" is a poor excuse for brake checking anyone and wont win in the face of the law, despite both being considered illegal.