Rebekah
I see the awful parts as well, Rebekah. I'm not stupid. I've seen him hurt people I love and care about. I know what he did to Mrs. Lockwood. He can be a real piece of work when he wants to be.
I just don't think he'd go after Katherine for fun right now or to simply be cruel to Elijah. I can't see him just going up to Elijah and being all "I'm going to kill Katherine" right now. A few months back, sure, but not anymore.