What Is the Example of the Professor Hammering Nails into a Pig's

What is the example of the professor hammering nails into a pig's back supposed to show?

A) Factory farms are places where people maliciously torture animals
B) It's correct to say that "whether or not some behavior is wrong is all relative"
C) Philosophy professors are often willing to do bad things to teach a lesson
D) It's not true that "what's true for you might not be true for me"
E) No student would actually have what it takes to intervene on behalf of the pig