Imagine what a world-class programmer could accomplish in this world if they thought 100 times faster than a human, and had no fear of going to jail. Our world is an insecure machine, and we're preparing to run untrusted code with root access.
And sure, maybe we can try to use less-intelligent AIs to secure things before then, but the weak point is still humans. Social engineering is typically way easier than straight up hacking. We've seen these lesser AIs threaten people, and while we can keep bonking them on the nose when they do that, we can't prove or tell that they won't ever do it in a different situation, when they judge that it's likely to be the most effective course of action.
I hope every day that this is all just hype and that another AI winter is coming, because we need time (who knows how long) for a way to align these things. But I really fear that it isn't.