I'm in that camp, because the rise of the far right will spiral into even more attacks, more violence, more people dying.
The rise of far-right is indeed a scary prospect. However, I have yet to see a contemporary right-winger in France, Germany, and so on, who calls for his voters to blow themselves up in crowds of hundreds of innocents As far as I know, no right-wing party commands a paramilitary like the Nazis did. We are still democracies. The greatest blasphemy against western liberal values comes from those who want to remove almost every civil liberty that we value, want to burn people alive, throw gays from rooftops, slaughter people by the thousands,
and use that as propaganda to recruit people, including Europeans.
The best medicine against the far-right is to concentrate on the actual root cause of our problems and thus drain their key selling point. We should not surrender ourselves to the far-right by reducing our politics to simplistic opposition to far-right talking points. That is granting them too much importance.
Even if one is of the opinion that there is nothing practical to be done because such attacks are avoidable, a more honest rhetoric would go a long way.
David Cameron's speech on extremism is a good example on how this can be done in a non-inflamatory, inclusive, but frank way. If more people would speak like this, less people would migrate to far-right parties.