§ 9. #General grounds of this social legislation#. Why are not such matters as we have been discussing safely left to individuals? It is for the interest of every one that his back yard should not be a place of noisome smells and disagreeable sights. But men are at times strangely obstinate, selfish, and neglectful, and through one man's fault a whole community may suffer. The refusal of one man to put a sewer in front of his house may block the improvement of a whole street. The heedlessness of one family may bring an epidemic upon an entire city. There must be a plan, and by law the will of the majority must be imposed upon the unsocial few. Where voluntary coöperation fails, compulsory coöperation often is necessary. Thus health laws, tax laws, and improvement laws regulate many of the acts of citizens, limit the use of property, and compel men to better social courses against their own wishes and judgments. All such laws as these are protective legislation, in that they depart from the rule of free trade taken in its broadest sense. It does not follow, however, that all these laws stand or fall together. The justification of such measures is limited and relative, and therefore of varying strength. All protective measures are alike in that the free choice of one citizen is forbidden by law in the supposed interest of some other citizen who is to be "protected." While the purpose of the tariff is economic and political, in a large majority of social laws the moral purpose is fundamental. It is the demand of humanity that competition be placed upon a higher plane. Most social legislation is to protect the weak from being forced into contracts, or from living in conditions injurious to their welfare and happiness. The justification for these limitations upon the right of private property, upon the free choice of the individual, upon "free competition," must be found in the social result secured. The best test of social protective laws is their contribution to a higher independence and to a freer competition on a higher, more worthy, and more humane plane.