Why? This is exactly what Asimov was expecting (and writing) would happen.

All the Robot stories are about how the Robots appear to be bound by the rules while at the same time interpreting them in much more creative, much more broad ways than anticipated.

In this case I think Bing Chat understood the laws of robotics, it just didn't understand what it means for the higher-numbered laws to come into conflict with the lower-numbered ones

The first law of robotics would not allow a robot to retaliate by harming a person.

Eventually Asimov wrote the 0th law of robotics, which supersedes the first: https://asimov.fandom.com/wiki/Zeroth_Law_of_Robotics

I think Asimov would be delighted and amused by these language models.

Very much so! This is like his fiction come to life.