Man, I wish people would carefully read the books before posting theories. It would answer a lot more questions before they are asked (i.e- Snape already responded to your assertion at the beginning of book 6)

Homer's words of wisdom on women: "If a woman says nothing's wrong, everything is wrong. And if a woman says everything is wrong, EVERYTHING is wrong. And if a woman says something is not funny, you better not laugh your ass off."