The only way this could ever be considered justifiable is if we are someday able to go back in time and shoot L Ron Hubbard in the face 16 times, just moments after his birth.
Until there comes a time in which this can come to fruition. JD Shapiro, you're on my castration list.
There is no apologizing for a movie as abysmally bad as Battlefield Earth. Just keep quiet and stop reminding people that you have any association with it.