
given are not, and could not possibly be, good enough to justify
so crippling a policy. Causes of different kinds do not compete.
They supplement each other. Nothing has one sole cause. And in
this case, the inside and outside causes of human behaviour—its
individual and social aspects—supplement each other so closely
that they make no sense apart. Both must always be considered. It
is understandable that embattled champions of the social aspect,
such as Marx and Durkheim, were exasperated by earlier neglect
of it, and in correcting that bias, slipped into producing its
mirror image. Nothing is easier than to acquire the faults of
one’s opponents. But in the hands of their successors, this habit
grew into a disastrous competitive tradition, a hallowed inter-
disciplinary vendetta. Social scientists today are beginning to see
the disadvantages of this blinkered approach. Now that it has
become dominant, these snags are very serious and call for sharp
attention.
However great may be the force of the external pressures on
people, we still need to understand the way in which those
people respond to the pressures. Infection can bring on fever, but
only in creatures with a suitable circulatory system. Like fever,
spite, resentment, envy, avarice, cruelty, meanness, hatred and
the rest are themselves complex states, and they produce com-
plex activities. Outside events may indeed bring them on, but,
like other malfunctions, they would not develop if we were not
prone to them. Simpler, non-social creatures are not capable of
these responses and do not show them. Neither do some defect-
ive humans. Emotionally, we are capable of these vices, because
we are capable of states opposite to them, namely the virtues,
and these virtues would be unreal if they did not have an oppos-
ite alternative. The vices are the defects of our qualities. Our
nature provides for both. If it did not, we should not be free.
These problems about the psychology of evil cannot be dealt
with simply by denying that aggression is innate. In the first
place, evil and aggression are not the same thing. Evil is much
the problem of natural evil 3