Penny puts the case for regulation far better than I did above, thankyou Penny! In the end these cultures descend toward violence to settle who is and who is not allowed to have a home, a family etc. In fact that is precisely why in the United States gun ownership is so well protected.
It is nearly always the case where males far exceed the law they will own several weapons and typicaly support other polygamists. So for example after David Koresh ( real name Vinny Howel - who had a previous Homicide history BTW ) was killed there was a well organised attempt to justify all he had done.
He had impregnated underage girls, used drugs as a means of entrapment and imprisioned some of his victims. The parent of any underage girl would not be welcome at Koresh City!
I think Thomas Hobbes amply expounded the consequences of no social contract and I do agree with his conclusions. How could we do otherwise?
Women who think they can outdo the animals we call polygamists may well think about this. In Africa where the pracitce has survived to this day the IQ of the average person is far lower than that of Europeans, the primitive reaction to crisis is violence rather than reflection etc etc.
Biological trends indicate that more of the brain of tribal society tends toward sexual function. In simple terms your brain falls out your ass. The hair of the head tends toward pubic type etc etc.