Which is actually a very good analogy. A lot of things can kill you, but only a human can be a murderer.

In movies and written fiction, "intelligent" robots, anthropomorphized animals, elves, dwarves and etc can all commit murder when given the attributes of humans.

We don't have real things with all human attributes but we're getting closer and as we get close "needs to be a human" will get thinner as an explanation of what is or isn't human for an act of murder, deception and so-forth.

And pit bulls, but I digress. The debate gets lost in translation when we start having what do words mean debate.