The Legislature of the State of California recognizes that among the principal causes of slum and blighted residential areas are the following factors:
(a) Inadequate enforcement of health, building, and safety laws.
(b) The fact that the limited financial resources of many human beings who inhabit them make only this type of housing available to such persons.
(c) Racial discrimination against persons of certain groups in seeking housing.
(d) The neglect of absentee landlords.
It is, therefore, declared to be the public policy of this State that, in order to cope with the problems of the rehabilitation of slum or blighted areas, these factors shall be taken into consideration in any rehabilitation or redevelopment program. It is further declared to be the public policy of this State that such rehabilitation or redevelopment programs shall not be undertaken and operated in such a manner as to exchange new slums for old slums or as to congest individuals from one slum to another slum.