We focus on the lost lives - not necessarily how they were lost (although the press seems to confuse that a bit).  The thing is to not focus on the excuse for human beings who perpetrated this.  Ignoring the terrorists completely would be the best approach - a complete news blackout on anything related to who did this.  But,  celebrate the lives that were lost because those left behind need to do that.  Compassion for the victim' families and friends is essential.