The bishop of Rome certainly placed himself on the firing line. The Byzantine emperor he quoted spoke some hard words - but were they false? The Islamic reaction across the world has seemed, if anything, to reinforce the veracity of what the Emperor said! Lord, have mercy. If Islam is this religion of peace that we constantly hear it is, where is a single Islamic voice being raised that condemns these "over the top" reactions?
Here's a link to an article on the topic that my brother-in-law sent me. I like it because it invites some thought about WHY the bishop of Rome quoted the Byzantine emperor - and I suspect this man's suppositions are correct.