Joseph Sin that LDS acknowledge?

So, as I observe the Group and some of the posts that I found were too childish and senseless. I don't know if they have the credibility to discuss Christianity or just love arguing something that's not even necessary for salvation. This Christian group is getting absurd that Christlike behavior is not even observed, rather provoking anger or hatred. But let's get to it anyway.

Okay, so here's some childish OP.
I don't know how this guy
think of us as LDS.
Seems like they misunderstood
Joseph Smiths Calling
VS as perfect man a prophet.
Did he said anything he sinless?

So, what is it we are looking for? What is the answer that satisfy the question? What is supposed to be discussed in such senseless OP? We as humans believe everyone makes plenty of mistakes and even Joseph Smith is not good about it. But let's just get to the answer using a scriptural statement rather than taking the bait. This wouldn't lead us somewhere, rather it just leads us to become childish.

Below are the list of quotes that possibly a good response, unless you don't like it -

Mormon 9:31 Condemn me not because of mine imperfection, neither my father, because of his imperfection, neither them who have written before him; but rather give thanks unto God that he hath made manifest unto you our imperfections, that ye may learn to be more wise than we have been.

...Who, among all the Saints in these last days can consider himself as good as our Lord? Who is as perfect? Who is as pure? Who is as holy as He was? Are they to be found? He never transgressed or broke a commandment or law of heaven—no deceit was in His mouth, neither was guile found in His heart. And yet one that ate with Him, who had often drunk of the same cup, was the first to lift up his heel against Him. Where is one like Christ? He cannot be found on earth....

(Teachings of the Prophet Joseph Smith)

And here's some Biblical Passage - 

1 Timothy 1:15 This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief.

The quote goes on. These are but just few quotes about LDS teachings on the life of Joseph. To think Joseph Smith Jr. was as just as Christ or sinless, isn't  a constructive criticism. Why bother opening up something not even close to reality?

Every sins that can be acknowledged of course everyone can easily acknowledge it. But there's not point in it by just looking up a sin and just a sin nothing more, nothing less. Why would everyone do that? Moses, David, Solomon, Abraham, Job and so on, were normal people who sinned throughout their lives. Do we need to acknowledge it?