If some have multiple wives, it means others have zero wives, since there wouldn't be enough females to go around.
Historically, following a war, there are too few husbands to go around. In strictly monogamous cultures, the result is that some women cannot find a husband and additionally typically have to also put up with harassment over their lack of a husband and children.
You appear to be doing a great deal of speculating without gathering much in the way of data to support your conclusions. This isn't exactly a best practice.
Historically, following a war, there are too few husbands to go around. In strictly monogamous cultures, the result is that some women cannot find a husband and additionally typically have to also put up with harassment over their lack of a husband and children.