I'm not sure whether you're making an argument about moral responsibility ultimately resting with humans - in which case I agree - or whether you're arguing that we'll be safe because nobody will do that with a model smart enough to be dangerous - in which case I'm extremely dubious. Plenty of people are already trying to make "agents" with GPT4 just for fun, and that's with a model that's not actively trying to manipulate them.
> actual real harms occurring now
Sure, but it's possible for there to be real harms now and also future potential harms of larger scope. Luckily many of the same potential policies - e.g. mandating public registration of large models, safety standards enforced by third-party audits, restrictions on allowed uses, etc - would plausibly be helpful for both.
> science fiction stories
There's no law of nature that says if something has appeared in a science fiction story, it can't appear in reality.