You need to inform yourself. There are numerous pregnant young teen girls. That’s because this group believes in and forces girls to have sex with grown older men almost as soon as the young girls hit puberty. Is that what you call “polygamy” that should be legalized? Sorry, not buying it.
I watched a program once wherein young Morman men told of how they were mistreated by being forbidden to interact with the young girls that had been programed to be used by older men.
I’m sorry too, you already bought it with the above which I tell you categorically did not happen. You may think it did but you would be wrong.