The IC doesn’t fear Biden’s mental health issue except for the fact that it now puts a stronger likelihood on President Trump taking back the office of the presidency. That office was just declared officially recognized by SCOTUS with the power and authority to deconstruct the IC.

https://theconservativetreehouse.com/blog/2024/07/11/hey-joe-the-call-is-coming-from-inside-the-building/

Removal of Executive Branch officials is a core duty, an official act, carrying absolute immunity.
That newly affirmed reality is exactly why the Intelligence Community and the Lawfare crowd are very alarmed.