Benn’s statement of the basis of the consideration we should have for imbeciles seems to me correct, but why should there be any fundamental inequality of claims between a dog and a human imbecile? Benn sees that if equal consideration depended on rationality, no reason could be given against using imbeciles for research purposes, as we now use dogs and guinea pigs. This will not do: “But of course we do distinguish imbeciles from animals in this regard,” he says. That the common distinction is justifiable is something Benn does not question; his problem is how it is to be justified. The answer he gives is this:
… we respect the interests of men and give them priority over dogs not insofar as they are rational, but because rationality is the human norm. We say it is unfair to exploit the deficiencies of the imbecile who falls short of the norm, just as it would be unfair, and not just ordinarily dishonest, to steal from a blind man. If we do not think in this way about dogs, it is because we do not see the irrationality of the dog as a deficiency or a [115] handicap, but as normal for the species. The characteristics, therefore, that distinguish the normal man from the normal dog make it intelligible for us to talk of other men having interests and capacities, and therefore claims, of precisely the same kind as we make on our own behalf. But although these characteristics may provide the point of the distinction between men and other species, they are not in fact the qualifying conditions for membership, to the distinguishing criteria of the class of morally considerable persons; and this is precisely because a man does not become a member of a different species, with its own standards of normality, by reason of not possessing these characteristics.
The final sentence of this passage gives the argument away. An imbecile, Benn concedes, may have no characteristics superior to those of a dog; nevertheless this does not make the imbecile a member of “a different species” as the dog is. Therefore it would be “unfair” to use the imbecile for medical research as we use the dog. But why? That the imbecile is not rational is just the way things have worked out, and the same is true of the dog – neither is any more responsible for their mental level. If it is unfair to take advantage of an isolated defect, why is it fair to take advantage of a more general limitation? I find it hard to see anything in this argument except a defense of preferring the interests of members of our own species because they are members of our own species. To those who think there might be more to it, I suggest the following mental exercise. Assume that it has been proven that there is a difference in the average, or normal, intelligence quotient for two different races, say whites and blacks. Then substitute the term “white” for every occurrence of “men” and “black” for every occurrence of “dog” in the passage quoted; and substitute “high I. Q. ” for “rationality” and when Benn talks of “imbeciles” replace this term by “dumb whites” – that is, whites who fall well below the normal white I. Q. score. Finally, change “species” to “race”. Now reread the passage. It has become a defense of a rigid, no-exceptions division between whites and blacks, based on I. Q. scores, not withstanding an admitted overlap between whites and blacks in this respect. The revised passage is, of course, outrageous, and this is not only because we have made fictitious assumptions in our substitutions. The point is that in the original passage Benn was defending a rigid division in the amount of consideration due to members of different species, despite admitted cases of overlap. If the original did not, at first reading strike us as being as outrageous as the revised version does, this is largely because although we are not racists ourselves, most of us are speciesists. Like the other articles, Benn’s stands as a warning of the ease with which the best minds can fall victim to a prevailing ideology.
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