In General Conference this week one of the Twelve Apostles, Jeffrey Holland said (paraphrased) that many Christians err in the verses in Revelation 22:18-19 that state:

18 For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book:

  19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book 
President Holland goes on to state that the “words of the book of this prophecy” are pertaining to only the book of Revelation and that having additional scripture such as the Book of Mormon is not adding or taking away from the book of Revelation.  He says many Christians err in that they think the “book of this prophecy” is the whole Bible and that many books in the Bible were written well after the book of Revelation was written. 
If this is the case, one could argue that even though Joseph Smith translated the Book of Mormon and other scripture, he did indeed add to the book of Revelation in at least five chapters which you can view here (make sure to scroll down to the bottom of the page to view the Book of Revelation translations).  One could argue that the hard life Joseph led and the imprisonments he had to face, the many babies that he and Emma had that died, and ultimately what caused his death were all part of the curses described in the book of Revelation.
The curse in Revelation doesn’t only mention adding to the book, but taking away from the book as well.  One could argue on the other hand that Joseph Smith wasn’t adding anything, but he was restoring the “plain and precious truths” that were taken out of the Bible as the Book of Mormon suggests.  One could argue that the “curses” that came as a result were persecution that has happened to other earlier Christians who translated the Bible or to those who don’t have the “fulness of the gospel.”  One could argue that Joseph Smith was persecuted because Satan was trying to thwart the work from progressing, etc. 
I can see why someone could side on the first option.  Especially those Christians who believe the Bible is all God has revealed and ever will reveal and that further revelation isn’t necessary and that throughout all the years there hasn’t been anything taken out of the Bible.  However I personally disagree with this.  I feel that continuing revelation is necessary and that many truths were indeed taken out of the Bible throughout the years.  In addition, if God had prophets and apostles before why wouldn’t he have them now?
What are your thoughts?