"His name shall be had for good and evil"

If you spend enough time on social media as a member of the church, it is inevitable you will find pretty vile things written about the church and especially Joseph Smith. It is manifestation of the words Moroni spoke to Joseph a few years after he received the "First Vision" when he told Joseph his name would be "had for good and evil among all nations, kindreds, and tongues". Why did Moroni need to share this with Joseph at the early part of his ministry? Perhaps he needed this warning early because he was already experiencing it. As soon as he tried sharing his experience of the "First Vision" with others, his name was being had for evil. Much of the worst criticisms you see about the prophet come from former members. This illustrates the point Elder Neil A. Maxwell made when he said, “Studying the Church … through the eyes of its defectors is like interviewing Judas to understand Jesus. Defectors always tell us more about themselves than about that from which they have departed.” 

I can't imagine caring enough about the prophet Mohammed enough to criticize the followers of Islam. There is another element at play when former members criticize and say awful things about the Prophet Joseph. President Russell M. Nelson said that "once we make a covenant with God, we leave neutral ground forever." Leaving neutral ground causes you to go toward Christ and his church or away from it.