Polygamy as a raw form could be okay, but the current form keeps women as objects, a harem for the male Barbarian who ‘owns’ them through marriage. No current case of polygamy is anything more than that. Once women can have multiple husbands as well, then there may be a valid situation for it. For now though, it’s just some 7th century man keeping a harem. Some of these wives are as young as 12, as in the case of Bountiful! Ugly minded religious leaders.