Why Polygamy if Allowed in Islam

Far from uproars and sentiments and forbearance of proceeds is, with relying on original religious text, polygamy in Jewish and Christianity really prohibited and unlawful?
On surface and primary reasoning it seems that the fair division of men and women draws towards unity and non-polygamy, to what extent does this assumption how scientific accuracy? Has an exact and true experience found a solution for the mental problem of polygamy? What are the certain social circumstances that state the necessary increasement.
You read, as a summary, The pertinent debates in this small book.