A lot of you seem to be missing the point of the apology and the reason for offering it.
This is a subtle thing, so you one-dimensional types, try very hard to understand.
You are not sorry you won the point. You are apologizing to your opponent that a random event took him/her out of the point and ended it in your favor.
You won the point not because of your skill in executing a shot or in forcing your opponent to make an error. It was a chance occurrence that happened to give you the point.
You are merely acknowledging that this is slightly regrettable with the quaint little ritual of holding up your hand and/or saying a quick "Sorry."
Hard to grasp?