It’s not about the dictionary definition of the term. It’s about the subconscious effect your choice of language has on how people think about things. When you call something an accident it gives people the signal that there was nothing that could have been done, and so nothing does get done. There’s no pressure on politicians and engineers in most of the anglosphere to do any of the things that would actually improve road safety. Indeed, a lot of the time when they do try to make our roads safer, you see fearmongering and NIMBY opposition against the idea.

Changing the language is one small step in helping to make our roads safer by making it clearer that making them safer is something we need to be concentrating on.