I'm with you. Probably because I like to kill my antagonists off right away. This is a question I don't ask myself enough - Why should the protagonist have all the fun character development? In the story I've been working on lately I've been using Christopher Waltz's take on Hans Landa as inspiration. Landa was such a monster but there were also subtle touches of depth and character. In the first scene he said he loved the nickname Jew Hunter. Later in the movie he totally reversed himself after some years. He acted quite disgusted at the name even. It's moments like those that I hope to capture - a narrative arch. Hopefully my antagonist can grow and learn a little bit before he gets literally kicked out of a starship about to leave atmo.