John McCain thought that revealing the dirty secrets of the White House would be a bad precedent, that advisors would no longer feel free to make underhanded and sleazy political advice to the President.
'"If we're going to set a precedent that those communications between someone who works for the president and the president of the United States are some day going to be made public, I think it could have a real chilling effect on the kind of candor in communications that people would have with the president," McCain said' from: White House Won't Show All Roberts Papers.
I have a radical and crazy idea...
Perhaps the Presidents advisors should only be giving advice that stands up to public scrutiny. Perhaps honest and forthright governance might be preferable to suggestions such as the kind Karl Rove is giving our President?