Think 3D printing, it's not all that hard to make a zip gun or similar home-made firearm, but it's still harder than selecting an STL and hitting print.
You could always find info about how to make a bomb or whatnot but you had to like, find and open a book or read a pdf, now an LLM will spoon-feed it to you step by step lowering the barrier.
"Crisis of accessibility" is simultaneously legitimate concern but also in my mind an example of "security by obscurity". that relying on situational friction to protect you from malfeasance is a failure to properly address the core issue.