"The label 'disaster' rather than 'accident' carries with it not only the implication that... an event... was of extraordinary misfortune.... but also the implication that it could (unlike most accidents) have been prevented.... disasters are events which fall within our scope of concern to prevent and in principle are events which may be prevented, and that we have a consequent obligation to attempt to prevent them" (Allinson 1993, 168-169)