Because shit just happens sometimes? It sounds more like you're just upset that the just world hypothesis doesn't hold up and that it's not required to for God to exist or not, and again, I state that to have a fit about if he does or not is just missing the entire point.
And also, those people basing their shit actions of "because God said so" would be doing it based on something else, so again, missing the entire point. You're getting mad about an argument nobody cares about except for getting a kick out of watching you charge the big red scarf instead of tackling the actual issue, the shitty actions, the choice someone makes to knowingly do things that hurt other people.