The actual guardrail should be getting materials being difficult. The information is already out there in the internet. If an LLM knows how to make a bomb or whatever, why do you think it knows?
https://venturebeat.com/technology/anthropic-ceo-calls-for-f...
(30 seconds of googling.)
Or perhaps you meant Q clearance nuke stuff? That would be QUITE a bit harder to find and illegal to share. But it’s lack of availability is hardly a counterpoint to the comment you were replying to.