Residential districts and their regulations are established in order to achieve, among others, the following purposes:
(a) Regulation of the bulk and location of buildings in relation to the land in order to obtain proper light, air, privacy, and usable open spaces on each zoning lot, as is appropriate for each district;
(b) Protection from noxious fumes, odors, dust, excessive noises, invasion of abnormal vehicular traffic, and other objectionable influences;
(c) Provision for the proper location of community facilities so as to increase the general convenience, safety, and amenities;
(d) Regulation of the density and distribution of population in scale with community services, and to avoid further congestion;
(e) Promotion of the most desirable and beneficial use of the land, promotion of stability, protection of the character of existing residential development, enhancement of land value, and conservation of the values of buildings, and bringing about the eventual conformity with a well-considered community plan. (1980 Code 151.10)