My first thought upon reading about the "bus plunge" tradition was that it was horrible. Thinking about it, however, I can see how journalists could get this way. Since, as the saying goes, no news is good news, it can be generalized that anytime there's news--in most cases, anyways--it's bad. You'd have to find some kind of humor somewhere, because otherwise it would just be depressing. It is, admittedly, morbidly humorous that the newspapers are more or less parodying themselves with this.
Other thoughts on The rise and fall of the "bus plunge"