It's hard to pull off a conspiracy if lots of people know about it. Would anyone be capable of inserting false data into variously owned satellites and radar systems? And so quickly? I doubt the US has any 'in' into INMARSAT, or at least not without the French knowing all about it.
Or would the shooting down have followed the sequence of confirmed events, with a group of perpetrators hoping that no new data emerges? Especially as there is a huge unch of experts of various nationalities telling the Malasian government what data should exist and where to look for it.
Now, there may be all sorts of garbage reaching the public as the media tries to circumvent the sole official line of investigation and pick on and analyse endlessly every single word uttered by any official whatsoever. And although confusion may seem like a good place to 'hide', in this case and when dealing with scientists and engineers, I'm not so sure.