I think going NC is a carefully considered choice
I was low contact with my father - he is now dead - and that was carefully considered too. It was also complex because I see mum all the time, so we had to have a conversation - we tried to work through our problems - but then eventually realised that the best thing was to go for courtesy hellos and then he stayed out of the way while I was there.
It wasn't easy but I can say categorically it was the right thing to do. It didn't stop us supporting each other through a couple of difficult times, including him having cancer.
I obviously don't know what has caused the rift between you and your DDs but I know he felt very strongly that being a parent meant I should forgive him for his problematic traits. I felt strongly that being a parent doesn't give you a free pass for being angry and irrational and screaming a lot - why would i choose to mix with someone like that.
In time, maybe the NC thing might mellow into low contact, or perhaps the relationship can be repaired. But in general, from my side, I can only say that a real apology is only expressed through change of behaviour.
if you think you are entitled to behave a certain way because xyz, you have to accept that some people will say "no, I'm not putting up with this".