I suspect that Joseph Smith was...
...a jerk
...arrogant
...mean to his wife
...mean to his kids
...mean to neighbors
...mean to his mother
...mean to the elderly
...etc...
Joseph was human, and divine inspiration notwithstanding, all humans act this way at some point or another. I think in many cases we put the Prophet (any of them) on a pedestal, and in doing so we elevate them above humanness. This only sets faith in their "other"ness up for a fall.
Prophets, Apostles, Bishops, etc... are all human, and therefore imperfect. Forgetting this, ignoring it, or worse hiding it, is actually dangerous.
Martin Luther was a vicious, anti-Semitic, lunatic at times. It does not mean he was not inspired as well.