You don't think a human using an LLM to generate content that convinces another human to press the launch button is a concern? Sure seems like there's more than one thing we need to do.
Honestly? I really don't! What kind of content do you think would trigger that? If humans were launching nukes based on Facebook posts we'd all be long dead! A good deep fake might trick your grandma, but it's not very likely to fool military intelligence.
The exact same concern already existed without LLMs. It is called social engineering, and has been a known risk for a while.