I am deeply and sincerely sorry that you thought you could beat me in an argument.

They say the best way to fight fire is with fire, but fire is useful for fighting all sorts of other things. Bees, for instance. Noisy neighbors. People who stand near bus stops in rabbit costumes. On another topic - sometimes people will try to get you to apologize by apologizing first for something less significant than, say, setting fire to someone's aunt. It's a rhetorical trick - don't fall for it!