Meta complies with legal warrant. The end.
In short, Nebraska government and attorney general are shit bags. The woman and Meta haven't done anything wrong. Meta should however advertise that only WhatsApp chat is E2E encrypted and that anything discussed on Messenger can be obtained via a warrant.
The only thing they meaningfully punished for is not making money. No wonder our world isn't going great.
But no, Meta wants to sniff your conversations so they can sell you shit. The cost of Meta's advertising is your freedom.
More people need reminded what can happen to them if they discuss controversial or illegal things on these ubiquitous chat programs.
Even if messages are set to disappear, they most likely will be logged anyway (Snapchat).