Its also not a real stretch to imagine a scenario where human decision making by a select few who have control over this leads to exactly the same thing. Do you trust Putin or ChatGPT more? (actual question, I don't know the answer).

I think we can "trust" Putin to keep doing what he's doing. Who knows what GPT-X might do?

Nuclear war leads to extremely long term and widespread environmental damage. Forcing technological regression on society by other means is much cleaner. Of course an agi won't care since it won't be limited to a human lifespan nor much inconvenienced by radiological pollution.