Re: It is a salvage mission in international waters, China should take over the search
"whose only possible albeit remote result is to pinpoint a point of impact and which of the pilots 'did it' "
Indeed. The deliberate disabling of the transponder and the controlled change of course shortly afterwards firmly point the finger at deliberate human action, most likely one of the flight crew. The only other possibility is terrorism whereby one or more terrorists with 777 knowledge overpowered the crew, took over the plane and then for some reason failed to carry out their mission since I doubt their mission would have been to allow the plane to ditch in the sea and not tell the whole world about it.