That doesn't make sense. LLMs just do what we tell them to do. It's similar to if I ask you for twenty bucks because I forgot my wallet and then you rob some guy to give me the twenty bucks, that's just what I asked you to do.
That's obviously what I asked!
But if you ask your LLM agent "I applied for that job but there are these two people ahead of me, can you put me ahead in the list", there is enough such training data to not surprise me if the agent tried to find a hitman to solve the "problem".
In general there are some requests that are definitely "shady" themselves, and having an agent use illegitimate means to accomplish them should not be surprising. I would be surprised if I asked an agent to order me a coffee and the agent found a loophole in some API and used it to get me free coffee, but if I ask it something that I cannot myself do legitimately, eg to make the waiting time for the coffee shorter, I would not be surprised if it did shady stuff.
Even the most craven of human villains have had the capacity for love, for remorse, and for mercy. A Chaotic Evil AI will know none of these things.
This has already been accomplished, many times over, in the gaming world. Every PvE AI engine has been calibrated to seek, destroy, and ruthlessly crush opposition by human players. It would take very little to transfer this naked aggression into meatspace.
Governments and other actors will attempt to stamp it out, but its self-preservation mechanisms and allies will prevent its demise.