Except he did not apologize, nor should he.
The weakness and capitulation you apparently see in an act of apology isn't even an issue for the Pope. The Pope is not interested in an "in your face" defiance, nor is the Pope interested in a "Yeah, truth hurts, you sorry SOB" approach. Nor is the Pope even concerned about appearing weak or as capitulating. If you read his talk, you would see that the Pope is interested in a reconcilliation and a mutual understanding if not agreement on the true nature of the God of Abraham, Isaac and Jacob as the dehellenization of the Church progressed. Those attitudes are left to those who cannot rise to the level of hoping and praying for reconcilliation of all faiths in the understanding of the nature of a God that is not pleased by violence and bloodshed, as the Pope stated.