Yes, they do. Caelan 100% does things I find morally reprehensible several times, both in his backstory and in the current timeline. But that's what makes him interesting in my opinion hahahahaha.
Chapter 14 for instance. It might have been a mistake, but he did hurt the person who he loved the most in the whole world, right when they were at their lowest point in life. He's also ex-special forces, so he had to have some sociopathic tendencies to keep his sanity on that job.
If you want to learn more, why not pop up and give it a read?