You know, there hasn’t been a technological advancement we’ve managed to refrain from using. So it’s either it’s just a matter of time, or it’s not possible due to some limitation(a).

Let’s assuming for a minute that this does eventuate, and some robot does manage to kill the cat: we’ll get over it. We haven’t regulated the car out of existence yet, and they have a tendency to kill quite the many cats.*

*all analogies breakdown under scrutiny.