Wow -- that sounds really incriminating except for one little detail -- the date the Phoenix Memo became such a media item. It was after 9/11, not before.
Do you have any idea how many reports are generated by FBI field agents on any given day? And they don't go straight to the President's desk, either -- they go into a huge intel system that filters and sorts it all. That's the problem with intelligence -- the tidbits of truth are buried in mountains of rumor, speculation, and untruths. It's easy to pick out those nuggets of truth after the fact, but not so easy beforehand.
The comparison to Pearl Harbor is more relevant than you think. Actually, there was far more intelligence warning ahead of Pearl Harbor, and there were (and still are) arguments that FDR ignored warnings and allowed it to happen in order to galvanize the nation and get us involved in WWII. I disagree with that notion for the same reason I discount the Bush theory. Anyone can predict the past -- the challenge is to predict the future.
Expat, the fact remains that the DIB regarding possible planes to be used for terrorist attacks was given in Aug to Bush.