They don't lie, because they don't ever have an understanding of truth vs any other language that sounds good. They don't cheat, because they can for example tell you the complete rules of chess, but don't know how to play chess without breaking those rules. They can recite rules, but they don't know what they are. They don't steal, because they don't understand ownership. In other words, they aren't intelligent. The…
This is sophistry. Of course it's just an algorithm. But it's placed in the context of serving humans, which have their own rules and expectations. What's more, they're often run by a company which is also made by humans and may carry over implicit interests.
This, really, was the point of the HAL story in 2001: HAL didn't murder anyone because it was incapable of malice. It just reasoned its way to a solution that could satisfy the contradictory goals it had been given.