Hugh Nibley, one of the smartest men to ever live by any objective standard, had this to say about some of his past writings.
I refuse to be held accountable for anything I wrote more than three years ago. For heaven's sake, I hope we are moving forward here! After all, the implication [is] that one mistake and it is all over with. How flattering to think that forty years I have not made one slip and I am still in business! I would say about four-fifths of everything I ever put down has changed. Of course! ("Of All Things" p. 229, a Hugh Nibley quote book edited by Gary Gillum, 2nd edition)
One unfortunate side effect of the archive-everything-search-anything internet is that many people feel they can no longer publicly discuss ideas because they might be branded with a particular position for the rest of their life.