Is it the answer that the IT and aviation industries are now so colossal, interlinked and important that it's more economical to pay insurance policies and hold thumbs?
I think many of us would agree with that assessment. It is a complex issue and battery technology continues to evolve with new, ever more potent chemistries.
The FAA video seems to feature mostly the old 18650 cells that are not used that much anymore in notebook computers. The more recent lithium polymer batteries have higher energy densities and readily adaptable form factors that make them popular in current notebooks, tablets and smart phones. There are numerous videos online of the spectacular demise of these LiPo batteries.
There is a lot of discussion here on Greta's flashlight forum:
Smoke and Fire, Hot Cells and Close Calls - The dangerous side of batteries