In addition to the findings and declarations made in § 8-124, which findings and declarations are incorporated herein and made a part of this section, it is further found and declared that (a) certain insanitary, deteriorated, deteriorating, slum or blighted areas, or portions thereof, may require acquisition and clearance, as provided in this part, since the prevailing condition of decay may make impracticable the reclamation of the area by conservation or rehabilitation, but other areas or portions thereof may, through the means provided in this part, be susceptible of conservation or rehabilitation in such a manner that the conditions and evils hereinbefore enumerated may be eliminated, remedied or prevented, and to the extent feasible salvable slum and blighted areas should be conserved and rehabilitated through voluntary action and the regulatory process, and (b) all powers conferred by this part are for public uses and purposes for which public money may be expended and such other powers exercised, and the necessity in the public interest for the provisions of this part is hereby declared as a matter of legislative determination. A municipality, to the greatest extent it determines to be feasible in carrying out the provisions of this part, shall afford maximum opportunity, consistent with the sound needs of the municipality as a whole, to the rehabilitation or redevelopment of areas by private enterprise.