All we know for sure so far, is that sufficient fuel remained on board the aircraft for continued flight. It may have been in the 'wrong' place, and may have been below the MLA.
Due to the fact that there is no voice recorder, and no data recorder, there is a distinct possibility we may never be able to recreate the sequence of events leading up to the accident. We are thereby denied the opportunity to understand precisely what happened.
This has occurred elsewhere previously, and in such circumstances it would be completely unjust to apportion fault to those who are, sadly, unable to offer their defence.
Lessons can be learned without the imperative of opprobrium.