Turbine D said, "Thought you left two words out: "Many folks think they know what happened.""
In very broad terms I think we all know what happened. The plane took off from Brazil and the flight ended improperly slightly North of the Equator in the Atlantic Ocean.
Actually we know a good more detail than that. What we don't know for sure is what matters - what has to be done or what can be done to prevent this happening again?