Anyone who's thought about it for a single second knows it's immoral to cancel a stranger's appointment without even speaking to them.

If the LLM did not act in line with that incredibly basic understanding, it's clearly misaligned.

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Was it a technically-simple hack?

Sure.

Kevin Mitnick got imprisoned for very simple hacks, usually involving more deceiving of humans than complicated programming prowess.

Nonetheless, the judge and jury found him guilty and sentenced him to jail.

Fundamentally, "hacking" in the "breaking security" sense is about violating trust and common sense social agreements / expectations.

The difficulty involved in so doing is irrelevant.