I will say this, it's crazy to think that you have an army of soldiers who can see their victims in their entirety, to see them as full on people by reading their entire minds, and yet are still dedicated to their mission. I know there was a faction that turned on the rest of the Yeerks, but you'd think given how their abilities work that you'd have a mostly unwilling army. One of the best ways to create a soldier who just kills on command even if it's civilians is to dehumanize the people they kill, but when you can read everything about your victim, surely it becomes impossible to do that. Even if it's ideology that drives them, the dehumanization factor is kind of important, it's hard to understand how they don't have more of their kind turning on them.