I have a close relative like this (not as nasty mind you) and I doubt he has ever apologised in his life, ever. He walked away from jobs, got into fist fights etc.
In any crisis, his first instinct is to apportion blame. And it happens to a weird extent. For instance if a drink were spilled, where I would mop it up and not think about it again, he would blame someone or something, perhaps the shape of the glass. I think it’s a reflex to deflect any blame from him??
And I see something very similar in my asd ds. We say sorry in this house though, and I always challenge the blame thing. But it’s not a trait that he’s learned from me or dh, or even from this relative as they don’t spend much time together. So I can’t help but think that maybe there’s some sort of genetic aspect to it.
My relative is trying and difficult to run along with but not actively nasty or unkind. When we argue, I don’t waste any energy looking for an apology that will never come. It’s a case of cooling off and letting bygones be bygones.
So in short, I do think it can be an issue for some people. Maybe not a physical incapability but more of a psychic improbability
. I think it’s a personal failing I can tolerate. But that doesn’t mean you can or should.
The more I ponder this the more convinced I am that he lacks the instincts and ability to repair relationships. We only have a relationship because of the accommodations I make.
It might be more helpful to ask yourself if you can forgive his behaviour? If it’s likely to be repeated? If you can live with a repeat of it? If you can live with a decision to stay nc. In other words, take the apology stipulation out of it and see where that leaves you. Because if you can’t forgive what he did, or feel you can’t expose yourself to his toxicity, then an apology won’t actually change that anyway iyswim.