It is the intent of the Legislature in adopting this article that the acquisition of such bonds or investments of the general improvement fund shall be for any or all of the following purposes:
(a)
Aiding or facilitating the making of needed public improvements in the city.
(b)
Limiting or preventing such increasing of district taxes or assessments as may impair the general tax revenues of the city from any district.
(c)
Providing means to reduce district indebtedness or assessments represented by or securing bonds.
(d)
Obtaining collection of delinquent city taxes.
(e)
Restoring property to the tax rolls in order that city taxes may be collected on such property.