I guess that is how it always starts.
Governments don't give up power, and once there's precedence for use of that power they'll continue to do it and begin eyeing the next power they can claim.
IF LLMs are THAT dangerous and powerful (and that's a huge if that I do not currently subscribe to), then no, no one should have access at all, there is no group of people in positions of power (government or corporate power) that I would consider "restrained"
From that, we can very reasonably conclude that the US government has a specific vendetta against Anthropic in particular, and that this vendetta has nothing to do with the technical merits of their product.
To my knowledge, they have yet to drop that classification, despite heavy court opposition.
Additionally: technical benchmarks suggest that the most recent ChatGPT models are within maybe 10% of Fable 5's capabilities, so this being a pure "capabilities" concern seems unlikely.
Uncertainty: It's possible that we have just suddenly reached the end of public AI releases, though - if ChatGPT 5.6 also gets blocked, that would be very good evidence of a general, non-weaponized policy. Given the recent Executive Order requiring pre-release audits of frontier models, this is somewhat more likely than it was a couple weeks ago.
I still think things add up to "weaponization is the most likely theory" and that one is being disingenuous to dismiss it as a reasonable possibility. But it's certainly NOT the only reasonable possibility.