What stops them*soutra*? - well we have not got an answer to that yet, but deliberate provocation in the form of cartoons that insult ALL people in that community, moderate and extremist, does not seem to be doing the trick. Indeed it would appear to have quite the opposite effect.
Journalists, governments and indeed all of us, need to take the long broad view and look at strategies that might make a positive difference and I think this involves mobilising the moderate community not seeking to antagonise them.
Journalists do become arrogant - I have personal experience of this - and take actions which they see as clever. But clever may not be wise and they need to stand back as a community and think how best they might serve the long term peace of the world.