If God is not evil, why did he send bears to rip apart 42 children for calling a man baldhead?

From there Elisha went up to Bethel. While he was on his way, some small boys came out of the city and jeered at him. Go up baldhead, they shouted, go up baldhead! The prophet turned and saw them, and he cursed them in the name of the Lord. Then two she-bears came out of the woods and tore forty two of the children to pieces. (2 Kings 2:23-24 NAB)