the Shadow is all the things you repress in yourself, so you're enraged when you see them in other people

Heh. I think the fact that I see a lot of the things I dislike about myself in Snape is why I cannot fathom the great love people have for him. He's bitter, he's mean, he's jealous, he desperately craves recognition and wants to belong to the most powerful group so he can avenge past slights and wrongs...