Selfish=/=Evil. Of the Captains you could probably make a convincing argument that one of them is evil and that's Mayuri. The Commander Captain may not have been a nice fellow but without Aizen's troll magic going on he generally acts in the best interest of his people and even Ichigo. Not having the same desires as the main character also doesn't make you evil. He was correct in saying not to go after Orohime after all, it was one big trap. Some of the other Captains are a little cold but when you're a trained killer it does happen. You kinda need to be.