So... we all know the bit about Cassie and the termite queen, and how she was so upset and guilty over killing her, that she tried to become a nothlit.
HOWEVER, in my brainstorming about what one would do with the script for a Not-Sucky Animorphs TV Show, and reading Cinnamon Bunzuh, I ran across something interesting:
In book 1, Cassie totally kills a guy.
And Cassie had gotten away clean. It had been the suspicious Controller policeman who had grabbed her. He was the only Controller to know her name, where she lived, and that she had been spying on The Sharing.
Cassie said we didn't have to worry about him anymore. She didn't want to talk about what had happened to him.
----The Invasion, Chapter Twenty-Seven
Now, I know the books tend to leave no mystery about what the characters are feeling; if something isn't mentioned, it generally isn't important or relevant. And this thing is never mentioned again.
BUT. Would it be realistic to assume that Cassie, as a person or character or whatever not just constrained to What Is Written, might be burying her guilt about this incident until the termite incident, when her horrible feelings about everything that she (and the Animorphs) have had to do come bursting forth? I think she DOES feel awful about the termite queen, because of the termite MORPH -- since the morph assigned the utmost significance to the life of the queen, killing the queen is the worst possible thing she could do in that morph. It's not because she, as Cassie, cares so deeply about a termite; it's just that see, as an empath, can't let go of the feeling of a morph that quickly. But the feeling of betraying all her values, and being a murderer, might also bring the other guilt to the surface.
What do you think, am I just reaching here? I seem to recall that Cassie only became so obsessive with being ethical AFTER the termite incident, so I think it's a reasonably valid insertion.