It is declared: (a) That there exist in the state insanitary or unsafe dwelling accommodations and that families of low and moderate income are forced to reside in such insanitary or unsafe accommodations; that within the state there is a shortage of safe or sanitary dwelling accommodations available at rents which families of low and moderate income can afford and that such families are forced to occupy overcrowded and congested dwelling accommodations; that such conditions cause an increase in and spread of disease and crime and constitute a menace to the health, safety, morals and welfare of the residents of the state and impair economic values; that such conditions necessitate excessive and disproportionate expenditures of public funds for crime prevention and punishment, public health and safety, fire and accident protection and other public services and facilities; (b) that slum areas cannot be cleared, nor can the shortage of safe and sanitary dwellings for families of low and moderate income be relieved, through the operation of private enterprise, and that the construction of housing projects for families of low and moderate income would, therefore, not be competitive with private enterprise; (c) that the clearance, replanning and reconstruction of the areas in which insanitary or unsafe housing conditions exist and the providing of safe and sanitary dwelling accommodations for families of low and moderate income are public uses and purposes for which public money may be spent and private property acquired; and the necessity in the public interest for the provisions hereinafter enacted is declared as a matter of legislative determination.