If you try, you quickly end up codifying absurdities like the 80%-finished-receiver rule in firearm regulation. See https://daytonatactical.com/how-to-finish-an-80-ar-15-lower-...
People who say "society should permit X, but only if it's difficult" have a view of the world incompatible with technological progress and usually not coherent at all.
The law is filled with these questions. "Well, how do you draw the line" was not a sufficient defense in Harris v. Forklift Systems.
The LLM itself is more akin to a gun available in a store in the "gun is a tool" argument (reasonable arguments on both side in my opinion); however, this situation more like a gun manufacturer creating a program to mass distribute free pistols to a masked crowd, with predictable consequences. I'd say the person running that program was either negligent or intentionally promoting havoc to the point where it should be investigated and regulated.
You left out "who controls the output of the tool", which makes it a strawman.