What’s to learn? From this incident specifically.

That a pilot with a history of mental health issues most likely did it? What does that teach us? And what are we going to do about it?

Anything shy of treating it as a disability and retiring the pilot with full pay until their retirement age will result in people still hiding rather than looking for help when they need it.

The USA doesn’t have cockpit cameras and has a pretty exceptional safety record, so I’m not sure what anyone is hoping to achieve other than blame someone, which is entirely contradictory to safety.