Polygamy in and of itself is not unethical, but some of the ways Joseph Smith went about it was.
There are always exceptions and you can find women who enter a plural marriage with no religous coercion, and are happy in this arrangement. You can also find slaves that are happy, swingers, etc. Those aside, I would like to focus on the mainstream LDS for this topic.
If polygamy was practiced again in the church, with the former teachings that it is required for exaltation, is it possible to live it righteously and ethically?
If we examine Joseph Smith's marriages as an example, lets go with the possibility that it was commanded by God.
When people say it was HOW Joseph lived it that made it immoral and not the principle itself, I would like to see how a perfect polygamous marriage would look like for an LDS family. If Joseph had lived it the way God commanded, what should his behavior have looked like to make an example of what God had intended as Celestial marriage?
Is the principle of polygamy more unethical than monogamy and why?