This is an arabic post I found in Islamic website, I just translated that post into English.
A Saudi man asking the Grand Mufti of Islamic law in Saudi Arabia Bin Baz.
Question: Some women prefer living in western countries because polygamy is not allowed, unlike here in Saudi Arabia. What do you think of that?
The Grand Mufti Answers: those who hated polygamy or alleged that stopping polygamy is better, are none believers and An apostate of Islam (left Islam). The penalty of apostasy is execution.
What is grand mufti? http://en.wikipedia.org/wiki/Grand_Mufti
Reference: the official website of the grand mufti of Saudi answering the man’s question Arabia http://www.binbaz.org.sa/mat/18069
Saudi Men believe that they have the right to marry 4 wives,as it says in the Quran or as law of Islam.
Bin Uthameen another Grand Mufti listing stupid reasons why Islam is allowing polygamy.
1- It’s necessary when the wife is too old or too sick and he has kids from his wife that he can’t just divorce her and yet he can’t have sex with her for the mentioned reasons.
2- Polygamy is a way of communication in sense that bonds a lot of families.
3- Protecting women in the sense of providing home and whatever needed as the husband is the primary financial provider.
4- Some men have strong sexual desires that one woman is not enough, so god’s was merciful in this matter by allowing Muslim men to marry more than one wife.
5- Sometimes after the marriage finds out that the wife can’t have children or she is sterile so better than divorcing his wife, he can just marry another one and keep the old wife.
6- Some men travels a lot and they feel lonely.
7- A lot of men died during wars so there are more women than men. Therefore, 1 man for every 4 women.
8- A married man might like a woman and the only way to have a legal relationship with her is to marry her.
9- Sometimes the couple would fight and the man divorces his wife, then he marries another woman. But later on he finds out that he wants to get back to his old wife, so rather than divorcing his new wife, he can just remarry his ex-wife.
10- Having more children as Muslim needs ( increasing the number of Muslims) to enforce the army with more soldiers for Jihad to fight the non believers ( non muslims ).
11- The woman will have time to do her studies or whatever she have to do as the husband is hanging around with the other wife.
12- Polygamy is good because it gives a break so the couples miss each other when it’s the other wives shift or turn.