Exactly halas. Given all the evidence, which is: the calmness of their voices; stating things were under control; then replying in the negative to the question from ATC about fuel dumping, they still did it. If there's another factor here, it is VERY DIFFICULT to see as even on approach there is nothing from them indicating a deteriorating situation. They dumped fuel without advising ATC (and probably the cabin crew and passengers too?), at the wrong level, in an area of high density traffic (what about airmanship?) and over a populated area all due to a rushed approach. The only escape will be that those valves opened by themselves. And yes I have some time on that type.