Do something about the tragedy . Donate money to a fund to help families that have suffered the most. Give blood if there is a need. Send cards to those who are in grief. Find stories of heroes and retell their stories.
Every crisis has heroes.
For example in the Jonesboro shooting tell about the teacher , Shannon Wright who threw herself in front of sixth-grader Emma Pittman. The girl wasn't hurt, but the teacher took two bullets and died later in the hospital. She gave her life for the students. Talk as a family everyday. Get together as church and openly talk about, what has happened, what you've felt during the tragedy, and what has helped.