I think your question is rhetorical, in which case I agree with the sentiment.
The US absolutely could (and very well might) make Chinese models illegal, possibly open weight models in general, but all that will do is keep them out of the hands of law abiding US citizens.
Law breakers in the US and the entire rest of the world would still have access, and nothing in the US will be any safer. People who think regulation will solve the problem should be embarrassed by their ignorance.
“Ban open weight models” Lol how. How do you even prove a model that I’m hosting is open weights?
Banning open weight models in the US would provide the rest of the world with a huge business advantage since these models are much more cost-effective than US models.
It may solve the problem of anthropic and open ai going out of business with all major consequences that would have for the rest of the US.