Essentially what you're asking for is beyond the scope of a simple conversation. It requires a lot of reading. A lot.

Those like Rock Waterman advocating that Joseph Smith's polygamy was fabricated are plagiarizing the fundamentalist and apologetic RLDS (Community of Christ) position that's exhaustively treated by Richard and Pamela Price in their book Joseph Smith Fought Polygamy

You can begin with some light reading by Quinn. Quinn has an excellent essay to get your feet wet, “Evidence for the Sexual Side of Joseph Smith’s Polygamy" [http://josephsmithspolygamy.org/wp-content/uploads/2014/01/Quinns-FINAL-RESPONSE.pdf]

Then, I'd suggest reading these books in whatever order you like: Rough Stone Rolling, In Sacred Loneliness, Persistence of Polygamy.

You're likely not going to read those books because you've not demonstrated that you really want to know this stuff.

So, I might suggest searching for the exhaustive discussions on the issue at places like MormonDiscussions.com—a site where all sides of Mormonism are permitted without any moderation. All viewpoints are permitted.

It's exhausting to get deep into the foliage of the issue because it requires so much time and reading. Quinn, Compton, Bushman, Hales, and the Prices, all have great research. Compton and Quinn have the best footnotes to the source material, hands down.