I was perusing the 'Another attack on monogamy' thread and it seemed to me from the responses that the website Monogamy as Divine Design hasn't been shared on this forum. It contains a lot of secular research done showing psychological and societal harms of polygamy and how all that can be related to early Mormon polygamy and I think it to be worth the read so I'll just link it here: http://historicalmonogamy.wixsite.com/divinedesign
It's the "sister" website of Historical Monogamy Doctrine: http://historicalmonogamy.wixsite.com/evidenceofdoctrine
Historical Monogamy Doctrine is the first website and argues doctrinally against polygamy having been commanded by God or practiced by Joseph Smith (and I suppose is intended to be read first -- it's also the Mormon history narrative that I myself align with.) And Monogamy as Divine Design continues the argument that polygamy isn't of God, mostly from the psychosocial angle -- even though its message is Mormon-polygamy-focused I think its info contains a lot of relevance when talking about secular non-monogamy ideas.