An important concern. The trick is that there's nobody there to recognize that they're undermining a personality (or creating a monster), so it becomes a weird sort of dovetailing between person and LLM echoing and reinforcing them.

There's nobody there to be held accountable. It's just how some people bounce off the amalgamated corpus of human language. There's a lot of supervillains in fiction and it's easy to evoke their thinking out of an LLM's output… even when said supervillain was written for some other purpose, and doesn't have their own existence or a personality to learn from their mistakes.

Doesn't matter. They're consistent words following patterns. You can evoke them too, and you can make them your AI guru. And the LLM is blameless: there's nobody there.