No matter if you consider the AI an autonomous agent or not, whoever set it off is still responsible for its actions. Nobody intends or instructs to blow up a nuclear power plant either, yet it's happened and somebody's to blame for it.
Usually not the guys at the bottom of the chain of command, even if they're human. And much less so if they're not.
I think the correct response to incidents like this, is stop messing with it before somebody gets hurt. But of course, just like shoddy nuclear power plants, it won't stop until there's a disaster of appreciable magnitude.
I completely agree that OpenAI is responsible for their AI agents, that they have been reckless, and that we need to prevent them from going further and doing irreversible damage to the world. To me, the "just a tool" framing implies that nothing dangerous is being done, which I fundamentally disagree with