Seo Racism

So I was wondering why are people who do shady seo called "black hats" and the good seo are called "white hats" ? Why does the black always have to be associated with bad? Yes I know its a term from security and other stuff but does that mean the seo community need to continue to be politically incorrect? Maybe it would be more politically correct to call them round hats and the goodie too shoes can be called square hats? (This is what happens when I have time to think on airplane =P )