[fluoridation]

The reason this kind of impersonation is illegal is because people are more likely to feel compelled to comply with an official and get taken advantage of, as well to preserve the authority the position (if anyone could claim to be an official with no repercussions, the claim would lose its weight, since the claimant could easily be an impersonator). If you pretend to be a government official with an LLM, the LLM is not going to have its opinion of people claiming to be government officials tainted, nor does it have access to any sensitive information that's not available by other means, nor is it possible to cheat it out of something that rightfully belongs to it.

Additionally, mens rea refers to the cognition that one is doing something wrong. It's not at all clear that lying to a person and lying to a computer program are subjectively equivalent or even similar to the liar, and given the previous paragraph I'd argue they are not. Why would someone feel guilty about doing something that can't possibly have repercussions?