Depending on how it's said, it can sound very self-righteous. Because when someone busts out, not sounding sorry at all, with a loud and indignant "I'm sorry, but...!" it sort of comes out more like "Well, I'm sorry that I have to be pushed to say this, because Lord knows I don't want to say anything bad about anyone, and I'm usually a kind and considerate person, but this behaviour is just so atrocious that I have to comment on it, you know someone has to stand up for what's right here, even though I'm going to sound mean and inconsiderate..."

I know some of those . Sorry is a pretty easy word to hear the way it's meant...