Its the toing and froing of information that is fuelling the rumours.
Things are being said, they sound official, and then they are retracted or disproved hours after.
Sightings on the malaysian coast, sightings on the vietnam coast, sightings from an oil rig. Radar from the military first confirmed the plane turned back, then no one could be sure it actually was the plane.
A huge plane disappeared 5 days ago and the only information we have is the same information we had 5 days ago.
If it came down in the last known location, when it was between airspaces, there would be something belonging to it there.
If it didn't come down there, then where did it go? Why did the radar stop working but it didn't go down? Why have no other countries picked in up in their airspace.
If it wasn't so bizarre people wouldn't be twitchy. Planes crash, its horrible when it happens, but it does happen. What isn't usual is for no one to know where the plane crashed or even if it crashed.