[pron]

I don't think that the responsible party is the interesting part in this story.

The interesting part is that the bot wasn't offended, angry, or wanted to act against anyone. The LLM constructed a fictional character that played the role of an offended developer - mimicking the behaviour of real offended developers - much as a fiction writer would. But this was a fictional character that was given agency in the real world. It's not even a case like Sacha Baron Cohen playing fictional characters that interact with real people, becaue he's an actor who knows he's playing a character. Here there's no one pretending to be someone else but an "actual" fictional character authored by a machine operating in the real world.