Whilst i personally find pictures showing impacts where people have lost their life distasteful (be they car crashes, aeroplane accidents, powerboat accidents e.g. Bluebird)., there is no denying they from a legitimate and powerful part of photojournalism.
Someone mentioned the Derry accident earlier - I personaly hate that image, not least because the knowledgeable are able to discern what the various elements are but from a journalistic viewpoint it is a image that conveys the tradgedy and terror of the moment.