It makes complete sense. You've basically been habitualized to this lifestyle that has lost it's shock value. That's why children who grow up around domestic violence find themselves in abusive relationships. Why? Because there's no shock value in it. Hence the phrase: "Been there, done that!" It's also oddly comforting because it's familiar. It takes a lot of soul searching and therapy to break this cycle of abuse just for this very reason.

Here's a simplified example: A toddler who's learning how to walk for his very first time, will cry endlessly after his very first fall to the ground. After the 3rd or 4rth fall - it's no big deal. He's become habituated.