Air France 447 Theories

With the downing of Air France 447, theories abound as to what happened to the flight. Is it weather related? Considering that there T-storms in the area, it is a possibility, but look at reality. Usually, a pilot can can maneuver out of the way by either climbing or going around the cell. Especially, in the Ocean, it seems they have more room to maneuver, if the pilots were paying attention. Also, turbulence and lighting have not been known to bring down planes from high altitude. Planes are built to withstand lighting and turbulence.
Another possibility is a complete breakup of the plane . This just doesn't happen either and the plane was fairly new.
Finally, there is terrorism. The pilots did not issue a mayday, indicating a catastrophic break up. A bomb will do that.
The fact that there was no mayday call and the plane just dropped off the radar, terrorism just cannot be ruled out.