Nature can be cruel. Predators are everywhere. Those who don't need to be protected from outside forces often need to be protected from themselves. In society, women are referred to as "the fairer sex". But in the wild, the female species can be far more ferocious than their male counterparts. Defending the nest is both our oldest and strongest instinct. And sometimes, it can also be the most gratifying.
Because I know something that you don't know. I know that this is the worst experience of your life, but I also know that someday you'll move past it and you'll be fine. And helping somebody likej you through the worst experience of her life is incredibly gratifying.