Battleground Question

My daughter made a statement when we went over to alliance side of the battleground from our horde characters. She mentioned that she did not want to fight in the same level battleground as our horde characters. (We have two rogues the same level only alliance) I asked her why? She said because I don't want to kill the same guys I fight with over there! Hmm... I never thought of it that way. I always kind of had the BRK attitude in the battlegrounds, I never really think of them as people, I think of them as standing in the way of my objectives.