system
A chat on subreddit /r/wallstreetbets
human
Unless there's some kind of gross negligence uncovered, this is probably just one of those statistical Russian Roulette events that's gonna happen eventually, and this time Southwest got caught with a bullet in the chamber.

gpt
The negligence would only be if SW was seriously neglecting upkeep. There's a good chance this hits the engine mfg. as much or more than SW.