Cazatou, then let us adopt both! I would be the first to agree with you that "human error" is the likeliest cause of any accident, be they fool or otherwise. Pilots may well be the first on the scene of such an accident, but that does not mean that the "human error" was necessarily "pilot error". So someone probably screwed up bigtime prior to this tragedy, but who and where? As a former SFSO I want to know the answer to that question, as I'm sure that you do too.