It's the professional modus-operandi: Things are done the old formal scientific way, you don't jump to the motive or conclusion before you've even assessed the evidence. No one's assessed the evidence. This same thing will be said at the outset of every single event that occurs for any reason.
No one has had time yet to determine the reason for the crash because no one has analyzed the physical evidence. You want to shorten your career in any field: Jump to conclusions. No one who has professional responsibility is going to do that.
That's what forums like this are for! My bet (so far) is with the barometric bomb in the luggage theory...(see, I'm really not a hoity-toity)...
Intuition works best in times like these; summing up a scenario from a fast integration of the sensed, the subconsciously sensed, and intellect.
Barring any capability for that, assume the worst, and disprove it. It's a better way to guard.