[weegee]

I would have thought that the computer would have been in the possession of criminal investigators as a result of his public demolition (which resulted in his death) and his attempts to buy "explosives" (through ebay and in person at a fertilizer store).

But I guess they left it turned on in the home.

Also it is possible to hit the backpace key and remove text that may be incriminating. "The message said this". Well is that ALL he typed?

If you look at Charles Bishop/Bishra's note, the word "terrorist" has been crossed out in "terrorist act I am about to commit". I'm not willing to believe without a doubt that he is the one who crossed that word out. He had only begun writing his letter. I would have started over if I made an editorial decision so early into say a love letter (or something equally emotional/high profile).

[BlessedByLiberty]

Agreed. It is my understanding that computer key strokes can be forensically traced back to original strokes.

I don't understand why, as you say, the computer wasn't in the possession of criminal investigators.

It appears that as questions regarding this arise - not all tin foil speculation - they will be "answered" by newly discovered information, evidence or announcements that something was overlooked.

Again, if I walk away from my computer, anyone here could simply walk over and type in whatever he/she wanted to write. Unless someone witnessed me typing the message, authorship is in question.