Getting upset with Jehovah's bloodthirsty tantrums is like getting upset with Darth Vader when he Force chokes someone. Why is it upsetting? It didn't really happen. The people in the story never existed.
The reason is because we like to put ourselves into every story. One philosopher described it like watching a play being performed on a stage in a theater. When the actor playing the villain walks out onto the stage our reaction is to jump up on the stage an punch the villain.
This is all function on Ego.