What a tragic loss of life. There are times when about all you can do is hang your head.
I know what you mean.There's simply no words.
One day there won't need to be.... "And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away." (Revelation 21:4)
As for the perpetrator...."It were better for him that a millstone were hanged about his neck, and he cast into the sea, than that he should offend one of these little ones." (Luke 17:2)