Deuteronomy 21:15-17 15 If a man have two wives, one beloved, and another hated, and they have born him children, both the beloved and the hated; and if the firstborn son be hers that was hated: 16 Then it shall be, when he maketh his sons to inherit that which he hath, that he may not make the son of the beloved firstborn before the son of the hated, which is indeed the firstborn: 17 But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.
Mark 10 . 6 But from the beginning of the creation God made them male and female. 7 For this cause shall a man leave his father and mother, and join to his wife; 8 And they two shall be one flesh: so then they are no more two, but one flesh. 9 What therefore God has joined together, let not man put asunder. 10 And in the house his disciples asked him again of the same matter. 11 And he said to them, Whoever shall put away his wife, and marry another, commits adultery against her. 12 And if a woman shall put away her husband, and be married to another, she commits adultery. --Amer. KJV
So, a man with three wives are all one flesh? If you read the account about Jacob, you will see that multiple marriages are really a disaster for the woman. The laws against bigamy and polygamy (and polyandry for that matter) need to be strictly enforced. Islam Condones Adultery, Rape and Pedophilia.
"British Muslim men reportedly bring about 12,000 brides to Britain each year, leaving UK-born Muslim females struggling to find a husband"
This is one reason for polygamy it overcomes the illegal immigrant rules. The muslim takeover of Britain is thus well established.
The other reason is that this is just another attack on Biblical Christianity which Satan and sin are trying to eradicate completely. In this respect both the muslim community and the Liberal community have this ultimate aim in common.