That this contention is sound cannot be gainsaid; but it does not go deep enough. Of itself, it no more explains the increase in divorce than it does the increase in crime and the increase in mental and nervous disease, equally in evidence since the Civil War. These, too, there is warrant for affirming, have increased because of changed economic conditions. It remains, however, to ascertain the precise factor or factors brought into operation by this economic change to account for the growth in crime, insanity, nervous troubles, and divorce. And, in this connection, it is most interesting and important to observe that, so far as concerns crime, insanity, and nervous troubles, recent research has made clear exactly why there has been an increase and how this may best be checked.
It is now recognised that, psychologically speaking, crime, insanity, and nervousness represent an imperfect adaptation to the environment in which the criminal, the lunatic, or the nervous person lives. This failure of adaptation may be due either to inborn lack of capacity to meet the requirements of the environment, or to lack of proper training.
Not so many years ago it was the consensus of scientific opinion that in most cases of crime, insanity and nervousness the victim was hopelessly handicapped from the start by the nature of his being. There was much talk of "inherited criminality," "congenital brain defects," and "neuropathic inheritance." But observation and experiment have compelled an almost complete abandonment of this doctrine of fatal degeneration. To-day scientists largely hold that not more than 1 or 2 per cent. of criminals can be stigmatised as criminals by birth; that insanity is not inheritable, like eye-colour or hair-colour; and that nervousness is, at bottom, an acquired, rather than inherited, disorder.
Accordingly, if crime, insanity, and nervousness are on the increase, it follows that faults of training, rather than innate and unescapable tendencies, are the responsible factors. More specifically, crime, insanity, and nervousness have increased because no adequate effort has been made, by appropriate training, to fit the individual to withstand the extra strain put upon him by the economic changes of the past half century.