Well, insult to these is common currency, especially in Europe, so it really wouldn't be much of a change. Boasting on the part of terrorists pretty much comes with the territory as well. Nothing new here.
Let me ask you a question - how would you feel about sending a few special operations squads in to shoot these guys when they start to brag? A few bodies in the streets of Baghdad? Paris? It wouldn't, after all, be anything they haven't already done to our troops. Just a thought...