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This is genuinely why there's no BSD character I 100% dislike. Everyone in BSD is portrayed in such a human way (even Fyodor and Nikolai). Personally, for me, it's what makes BSD very beautiful, in all the ugliness shown in the story and relationships. I find in some media that there's a narrative for certain characters being 'good' and some 'bad.' I'm not saying BSD has no protagonists or antagonists, I'm saying that BSD doesn't shy away from showing the character strengths and flaws of either. There isn't that much of a narrative going, 'Oh, you should like this character and dislike this one.' Tying back to OP, one amazing way BSD does this is how it portrays abuse.
Hi by the way I'm never going to not throw up when thinking about what BSD says about abusers and victims. Abuse can occur out of love or a desire to protect or save or help someone and it's still abuse. Abuse can occur and years later you will still feel the affects so deeply it's as if it's a part of your body. Your abuser can change and regret and sometimes that means you will walk away over and over and sometimes it means you will throw yourself at them over and over and both are because you never developed a sense of self beyond what they made you to be. Your abuser will die and you will cry and you will hate him and in your weakest moments his memory will be there. Your abuser will live and become a better person and you're still stuck there unable to move on. The sheer complexity of what it allows and asks of us - to understand that at the end of the day we're all people fucking each other up and making mistakes. No one is a monster and wouldn't it just be easier if we were?