"He is good, and He only bestows blessings and never does harm"
Let's see: There's Noah and the flood; Lot and Sodom and Gomorrah; Moses and Pharoah plagues/firstborn death/ Red Sea; Joshua and the "longest day"; Gideon and the 300; David and Goliath; Assyria and the Northern tribes; Chaldea and the Southern tribes; the Crucifixion; Peter and Ananias and Sapphira. Did I leave anything out?
"Did I leave anything out?"
Just understanding.
"No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again. This commandment have I received of my Father." -- John 10:18
God commanded Christ to lay down His life for His sheep, which He did, willingly, "for the joy that was set before him" (the "joy" being the salvation of His elect.)
"Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God." -- Hebrews 12:2
Indeed, but considering the alternatives, which were the horror of every description of sin, where is the harm? Is it better for a child slain by Joshua to be with God or to grow up idolater?