How and why does Golding create the reader’s sympathy for the sow when the boys first come across her?

Golding creates sympathy for the sow when he informs the reader that she is a mother, surrounded by piglets, that she was "sunk in deep maternal bliss". I cannot speak for Golding, but I believe this vision of the sow and the sympathy it creates is meant to illustrate to the reader just how callous and barbaric the hunters have become.