First, its great that Larry Dixon is OK after such a spectacular crash.
All the safety equipement, and landing on the tires on the track side of the guardrail were fortunate.
NHRA shortened the quarter mile (1,320 feet) to 1,000 feet to lower the speeds. Its clear that with technology the Hemis are generating massive horsepower. While dragsters have flexible frames to improve traction.
Massive horsepower, massive torque, the wings in front and back, the frame flexes, then breaks.
Hopefully the folks at NHRA will take a "hard look" at what happened, and what caused the frame to break.