Prayers for Sandy Hook Elementary

There is so much I could say and so much I don't know how to say. How do we make sense of the Sandy Hook Elementary tragedy?

Psalm 23

The Lord is my shepherd; I shall not want.
He makes me lie down in green pastures; he leads me beside still waters.
He restores my soul; he leads me in the paths of righteousness for his name’s sake.
Even though I walk through the valley of the shadow of death, I will fear no evil; for you are with me; your rod and your staff comfort me.
You prepare a table before me in the presence of my enemies; you anoint my head with oil; my cup runs over.
Surely goodness and loving kindness shall follow me all the days of my life; and I will dwell in the house of the Lord forever.