To the extent that there is personal opinion - one could say. However, you overtly avoided smith's own admission - is smith "tainted"? Further there is the scope of the evidence John. there are the testimonies of his other wives, testimonies of his closest associates, the reason for the destruction of the Expositor, etc. And speaking of tainted, how tainted were the founders of rlds WHO stated smith was a polygamist (cited previously).
Really now John, Occam's razor really comes into play here. Not all the sources stating smith was a polygamist were trying to "justify" their sinful behavior, not all the evidence is completely colored as to render it unusable. Plain and simple John.
And you have a 'testimony' of a boy who's mom hated the polygamy smith started and sought to set her son as the next prophet - creating a schism on a key point - polygamy. A myth built upon the myth of mormonism John.
The composite evidence John, outweighs the evidence you've provided to date.
If I had the date of the first publication of it, the name and motives of the publisher of it, and some commentary on it from persons other than enemies of the church, for balance, then I might be able to deal with it. My guess is that it was fabricated by polygamists to justify their sins, or by enemies of the church who thought they could get away with "making things up".
Some lies are so impressive that they are taken as fact. For example, Tina Fey's imitation of Sarah Palin saying, "I can see Russia from my house," is taken by many as being something that Sarah Palin actually said, and many will never, because they are closeminded, believe that she did not say it.