I think I rather agree. Death, especially in literature (and, mind you, I am not calling the Harry Potter series literature), is always for a bloody good reason. In my own novel, I've tried restructuring it four different ways to see if I can avoid killing one of my favorite characters. Thing is, it simply doesn't work. He has to die, it's half the plot. Not only that, but most of the character development with the others takes place only because of his death. It's just... nothing to be upset about, at least not in a throwing-the-book-away sort of thing (I hope).