A friendly and helpful AI assistant that doesn't have any safety guardrails will give you detailed instructions for how to build and operate a bioweapon lab in the same style it will give you a cake recipe; and it will walk you though the process of writing code to search for dangerous nerve agents with the same apparent eagerness as when you ask for an implementation of Pong written in PostScript.
A different AI, one which can be used to create lip-synced translations of videos, can also be used to create realistic fakes that say anything at all, and that can be combined with an LLM to make a much more convincing simulacra — even just giving them cloned voices of real people makes them seem more real and this has already been used for novel fraud.