That the much agitated question of mens rea in manslaughter should again be essayed may require some justification. Such is readily found in the deplorable circumstance that this major crime remains obscure and controversial in its most important aspect. Decisions may be found to support any of a variety of views about the presence, absence or nature of the mental element in manslaughter; textbooks on criminal law differ widely on the question; and student, teacher, practitioner, and doubtless also sometimes judge, are left in bewilderment by the abundance and variety of dicta, argument and opinion on the subject. This may seem good reason for not adding another view, but the writer is persuaded that, upon the basis of much valuable inquiry carried out in recent years by a number of workers in the field, it is now possible to state in reasonably clear and confident terms what is that element which, together with the actus reus of killing, constitutes the crime of manslaughter in English law. The writer would begin by acknowledging his indebtedness in particular to various writings of Dr. Turner, Dr. Glanville Williams and Professor Hart. They are not to blame for what follows; but whatever illumination this article may shed is the result of his study of their work.
Encouragement to write this article was derived from the following passage in Russell on Crime:
“It is … incumbent upon writers, especially in matters of general principle, whenever there appears to be a lack of precision in the authorities, to make concrete suggestions for the removal of doubts and difficulties.