They are focusing on weakness/fatigue of the vertical stabilizer composites. That the plane simply had a structural failure doesn't exactly reassure people who are afraid of flying, does it?
This account does not take into account the multiple eyewitness reports of "fire" or "smoke" or "explosion." Some seeing more than one explosion.
One states he knows at least 13 other people who saw "fire" or "explosion."
YOU can discount this info if you want, but I believe these men.