The habitual apologies might be a compensation for the general irritability in a particular culture? I apologize more than I should and will spend some time thinking about why. Maybe part of it is when someone expresses sadness, irritability, or anything negative and it seems you are supposed to say something, "I'm sorry" seems as good as anything. For me there is also a concern about people crossing into the realm of conflict. Once people get fighty it's hard to bring them back. A quick sorry might help nip it in the bud? Also, there are times it's not a personal apology but an expression of sympathy. Confusing the two could be pretty funny actually.