Another explanation for why bad things happen in this world is that Satan is seeking to destroy the things of God.
Satan is Legalistic
Satan knows that it is we whom God loves, that it is we whom God created this world for, and it is we with whom God seeks to have fellowship and relationship. So as an attack on God, Satan seeks to attack and destroy us. He does this through a variety of means. Sometimes Satan accuses us, condemns us, and brings charges against us before God, demanding that justice be served (Rev 12:10). Satan is the ultimate legalist and seeks to destroy our lives by demanding that the punishment required by the law be brought down upon our heads.
Satan Encourages Harm to Nature
Aside from seeking our destruction through a legalistic application of the law of God, Satan also uses his power and influence in this world to create chaos and conflict, inspire hatred and hostility, and instigate violence and bloodshed. All the wars, murders, rapes, and abuse in the world have been influenced by Satanic forces in some way or another. Certainly, much of the blame for these things lie at the feet of mankind, but Satan encourages these destructive behaviors and fans the flames of proud and arrogant men arguing over land, possessions, privilege, and power. Satan seeks only to destroy . War, bloodshed, and fighting are among his favorite methods.