I think we have to admire anyone who tries, even if he/she fails to push the boundaries of flight. as we say in general/commercial aviation, there is something to learn from every accident/incident. let's do the same here.. I am no expert on fuel systems etc, but surely (Shirley) there must be something we can learn here and do better next time, whether it is Virgin or someone else. I am less concerned with someone's end motives than their willingness to take risks to move forward.