"It is unfortunate that a large number of users here are not hackers, not even in an idealistic philosophical sense, and will betray the public good for their own short-term gain. You either unite the world or you divide it."
Also, the premise is partially nonsense because China won't stop and open models won't stop. They will lag by a year or two and that will be all. At that time the export control will become frivolous. We will have to go through a phase whereby there are vulnerabilities that need patching. Once this phase is over, we will be fine. All new server software will have to voluntarily undergo an AI audit for safety. The national security apparatus is more worried about vulnerabilities being patched than about them being exploited, as they can't exploit what gets patched.
As for engineering viruses, the labs can do it without AI.