I believe that simply fail to understand why God allows things like this to happen - when it happens. In the fullness of time - for each one of us, including the families, friends and neighbors of the children killed at Sandy Hook, - there will come a time when we sense there was a reason for this.
That will be our "Adam and Eve like test." Will we perceive the event as allowed by God for His purposes to accomplish something for us - see Romans 8:28 : And we know that in all things God works for the good of those who love Him, who have been called according to His purpose"? Or will we heed the Serpent, (cont'd)