Is that how humans work? even if I give explicit instructions not to lie, a human might still lie. To quote a person you might know "it's not a difficult concept!"
But we still try to stop people from doing so, and we punish people who do. Many good honest people, when confronted with the end of their business, accept it and file for bankruptcy. Those that choose to instead commit fraud don't get a pass because they were "under pressure", they get jail time.
An LLM isn't human. I don't really understand this thread of "humans do it so of course an AI does". These are things we ourselves are engineering in a way we cannot do with a human being. Why is it not reasonable to expect it to adhere to rules better than a human does?
If a human lies there are consequences. They can lose their job. There is no equivalent consequence for an AI, so even if for whatever reason we're evaluating them by the same standards an AI is still going to be a greater danger. It seems wild to me that folks are shrugging their shoulders at that.