[ams6110]

I do think the complacency issue might be a component here. Humans tend to quickly accept recent history as "normal" and over time forget the lessons learned by past disasters.

"Those who don't remember history are doomed to repeat it"

It's been a couple of decades I think, maybe more, since an engineering screwup affected a passenger airliner like this. You could argue that the 787 LiIon battery thermal runaway thing was a red flag. That also resulted in an FAA grounding, but that was fairly easily remedied and nobody died.