A child NO matter what culture or geographic location, every culture has children, and every culture has ADULT MEN, and ADULT WOMEN, who are in nature, physically, as well as mentally matured.
And children structures, still are NOT capable physically, or mentally to sustain a marriage functions of a ADULT nature.
There are many responsibilities, that are apart of marriage including raising children, providing everyday necessities for their families etc.
Again you have children raising children, and just because a specific culture decides this does NOT make it OK.
Just because a entire culture decides and agrees to do something outrages, and wrong, does NOT make it right.
For example: If a entire culture or region decides that children should leave the home completely, and feed themselves, and provide for themselves at 5 five years of age would this be OK? of course NOT, and this is absurd, and marrying children seems just as absurd, who have NOT matured into adulthood.
There is NOTHING attractive about a child, and I still wonder how the any man could possibly marry, and even produce children with a child, I cannot fathom this at all, this is certainly beyond my comprehension.