Not only has the constant multiplication of penal laws helped without avail to fill jails, but the failure to repeal laws that are outgrown does its part. As already stated, there are many anti-social and annoying things that can be done without violating the law. This, no doubt, is responsible for some of the general statutes like that aimed at the confidence game that catches a victim when the crime is not clearly defined as in "robbery," "burglary," "larceny" and the like. Still it has been the general opinion of those who have studied crime and influenced the passage of penal laws, that criminal statutes should be clear and explicit so that all would know what they must not do. It is obvious that if one is to be punished simply for doing wrong, there could be no judges or juries or jailers condemning and punishing and no crowds shouting for vengeance. All do wrong and do it over and over again, and day by day. It is not only those specific things that the great majority think are wrong, but the graver offenses that are meant to be the subject of criminal codes. Of course, codes do not work out this way in practice. In effect, they forbid the things that the strongest forces of the community wish forbidden, things which may or may not be the gravest and most anti-social acts, but which at least seem to the strong to be most hostile to their interests and ruling emotions.
So long as the ordinary ideal of punishment prevails, a crime must consist of an act coupled with an intent to do the thing, which probably means an intent to do evil. This is no doubt the right interpretation of intent, although cases can be found, generally of a minor grade, which hold that evil intent is not necessary to the crime. Under the law as generally laid down, insanity is a defense to crime when the insanity is so far advanced as to blot out and obliterate the sense of right and wrong or render the accused unable to choose the right and avoid the wrong. Of course, legal definitions of scientific terms, processes, or things, do not ordinarily show the highest wisdom. It is safe to say that few judges or lawyers have ever been students of insanity, of the relation of "will" to "conduct," or of other questions of science or philosophy. Each man confines himself to his field of operation, and the love of living does not induce him to go far from the matter in hand, which to him means the base of supplies.