A Skeptic claimed that the end of Revelation contains a failed prophecy. Towards the end of the book John(Revelation 22:18-19) writes:
"I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book. And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book."
However, Joseph Smith altered Revelation's text in his translation of the Bible. The Skeptic then inquires why Smith did not experience any of the plagues discussed in Revelation.
The Skeptic committed an error similar to that of both Christians and skeptics who use Revelation 22:18-19 to address changes to any part of the Bible (not just Revelation). Many have pointed out that Rev, 22:18-19 is only meant to apply to Revelation itself, and this is true, but I think it goes deeper than that.
Revelation is a sort of legal document -- part of what could be called a "covenant lawsuit" against those who have failed in their adherence to God's covenant. In that sense, the warning would therefore apply only to the original document penned by John, not to unofficial copies. In other words, it is just as it is in modern courts, which will not tolerate anyone tampering with official filings (which lawsuit parties might be tempted to do!), but would hardly care if someone took a copy of a legal document home and defaced it.
So, Joseph Smith would no more be subject to those plagues that a person would go to jail for removing one of those mattress tags.