Interesting observations by the people who responded to my post. You all make very good points.
However, I have this to say. Even so, I still don't understand how a non-pedophile heterosexual man could want to marry and have regular sexual relations with a 6-year-old or 11-year-old girl.
Speaking as a heterosexual adult woman, nothing in the known world or any other could ever possibly induce me to have sex with a boy. The very thought of a woman having sex with a prepubescent boy sends chills down my spine. "Creepy" doesn't come close to describing it. Not only would I wouldn't consider doing it, I wouldn't even consider considering it.
Having sex with a 14-year-old, 15-year-old, 16-year-old...well, I would never do it but at least it's not something out of a parallel universe. I can imagine being attracted to one, even if only marginally and with zero actual action taken. I, of course, wouldn't do it but it's not absolutely alien to my nature. Not alien to any emotion I've ever had.
So I can't imagine how a 50-year-old man would be able to go to bed with a prepubescent girl and feel anything but repulsion, unless he were a pedophile.
Well, I guess that's the answer. Child marriage is a cover for pedophilia. Nothing but legalized pedophilia.