Why is there so much evil in the world? Where did it all come from? And why doesn't God do something about it?
In the beginning God told Adam and Eve to fill the world and to rule and subdue it. The garden was devoid of evil - it was good. When Adam and Eve chose to grasp for the knowledge of good and evil so that their eyes were opened and they became like God, they were choosing to submit to a power structure other than their Creator's. Adam and Eve and their children traded the value system and the culture handed them by their loving Father for the value system and culture of a deceiving snake.
Put another way, God did do something about evil. He created a perfect place that had none. Then he put us in charge of it. We chose and continue to choose to opt for actions and values that have nothing to do with the life-bringing authority of God. Rather, we grasp for what we want over and over again - affirming and aligning ourselves with a power whose sole agenda is to lie, steal and destroy.
The real question is why do WE let bad things happen to good people?
Their is so much evil in the world because our response to evil is to conform to the pattern of this world (Rom. 12:2) and to help it multiply by repaying evil for evil (Rom. 12:17). We have come up with some "good" ways to stem the growth of evil (self-defense, military defense, incarceration, the death penalty, etc), but invariably we use a little evil for the greater good of the general population. And violence always births more violence (Mt. 26:52).
Now I would suggest to you that nations/governmental powers have to behave like this to preserve themselves. However, the people who are followers of Jesus, who are strangers or aliens in this world (1Peter 2:11) and citizens of another (Phil. 3:20) have aligned themselves with Jesus, who did not consider being like God something to be grasped at. Rather he chose the weakness of serving and the humiliation of death (Phil. 2:6-8) as his strategy to rid the world of evil.
When Christians figure out the centrality of Jesus' example of sacrificial love and live it consistently we will give the world a choice, as Jesus did, to overcome evil with good (Romans12:21). Why aren't WE doing something about the evil in this world?
Just some stuff we should talk about.