When Pope Benedict quoted that 12th Century Byzantine emperor he made a mistake. As top diplomat for over a billion Catholics he should have chosen his words more prudently. It happens. He is, after all, only human. Humans make mistakes and they apologize.
Unfortunately, the Pope is annointed by God; he is supposed to be infallible. The best Benedict could manage was to express sorrow at the reaction to his talk. If I accidently hit you in the nose, I say "I'm sorry." I don't say, "I'm sorry you're still crying because I hit you."
That last one doesn't cut it. It lacks compassion. It's not good, being a Pope without compassion.