And why they had those beliefs? How come they could "think"? What action triggered those things? Did someone install software on a server that "just came alive" and then all bets were off? Or was this part of security testing and evaluation, where a human wrote a prompt that the agent read, which lead to all of that?

Do you seriously not grok how LLMs work? They're not 100% autonomous and self-acting, that'd be bananas.