I point my finger at Jules.
Double Yellows have been waved long before sutil even came out of the car.
The next finger to point is on the information system for the drivers. I think they need two conspicuous lamps in the car that flash whatever colour flag is being waved in an area.
I am assuming that Bianchi did not see the yellow flags. However I figure as much the team would have that information to give him. Whatever the case is, I think Bianchi was going too fast. The kind of damage done had to be a high speed crash.
Some speed similar to Massa's and Perez crash in Canada this year.
I hope the concussion is the extent of his injuries and not a broken neck. I see that the cockpit is intact and the way how it is designed is that the head cannot the snapped outwards and hit a wall because of the thickness of the sides of the cockpit.
I have a hidden confidence that he should recover after receiving some world class care.
It's a sad way to end a stunning race, but somehow I think Bianchi really did himself in with this one.
I wont blame Charlie or anybody else. The only improvements I can think of is a system such a big lights in the cockpit that flash, or Placing bumpers on the cranes or use boom trucks instead of tractor cranes.