Eduk:
F4 that is a story. It is interesting that you think it's about circumciscion.
It was just meant to be an (in my opinion) amusing and interesting aside. It may be nothing more than a story of a novel and clever means of revenge, but given the importance of circumcision to Judaism I suspect there is something more going on. Circumcision has never been simple about the procedure.
You say: “what’s the harm?” I do not think the harm is all that great, but I do not think that addresses the question of why it should be done in the first place.