The questions of liability and encyclopedic nature are really tangential to the core reasons for the guideline. The text of the guideline and discussions about it have generally made no reference to whether the material is encyclopedic or whether legal ramifications exist for having the wrong information. Since many of the editors of drug information have some connection to the health care industry, whether as physicians or nurses or etc., the focus has understandably been about the potential for harming people who use incorrect information or misuse correct information. I haven't seen this problem adequately addressed here; it's roughly analogous to why we don't include instructions on how to make bombs. A specialist encyclopedia of explosives and ordnance might include information on how such weapons are built, but we don't. Similarly, medical references include information on lethal dosages and dangerous applications for drugs, but we don't.
Nathan