What I would encourage all to do is remember that for those who survived, their journey is just starting. The attack itself was a horrible trauma, but the psychological and spiritual journeys will be lifelong.
While evil abounds, love can repudiate everything it stands for, especially when we talk of hate and terror. I would use my sermon from just a few weeks ago to illustrate beautiful examples of how community and relationships can begin the healing process through love.
I'll end with my benediction from that day:
Carry each other’s burdens and so you will fulfill the law of Christ. Let’s not get tired of doing good, because in time we’ll have a harvest if we don’t give up. So then, let’s work for the good of all whenever we have an opportunity, and especially for those in the household of faith. Galatians 6:2, 9-10 (CEB)