The biggest failure was the delay in the flight termination system working. If it had sailed towards the town they might not have been able to terminate it in time.
I would probably add the damage to the launch pad to the list. That seemed to add unnecessary delay to the next launch though I don’t know if it was the long pole or not.
That was part of it, but the engine failures that immediately caused a loss of trajectory (it was visibly off even before it cleared the pad) were most likely the worst problem.
The engine failures didn’t cause the rocket to deviate significantly from its planned trajectory. The biggest failure was a fire causing the flight control system to lose communications with the engines, at which point the rocket was out of control.
