Allow me to explain to the best of my understanding, Wing.
God originally had to intention of allowing things to happen on Earth, because in his original plan there would be no such thing as sin. But, the angel Lucifer desired God's power, and since he could not attain it, he managed to get a third of the angels of heaven to become separatists, and thus the angels fell and became demons, Lucifer became Satan. God had set an ultimate test up for Adam and Eve, one of faithfulness. The tree of knowledge was off limits in the Garden of Eden to man. Why was it off limits? For no reason except that God wanted to see if man would obey him, and there was no reason for man not to obey God until Eve was tempted by Satan in the form of a snake, and since man failed the test of faithfulness, sin was allowed in the world. Since God punished man by making him imperfect, he was now suceptible to the influence of evil. Only a perfect being, that being God, cannot be corrupted by Satanic influence. Why does God allow horrible things to happen on earth? He is a caring God (if he wasn't than we would either have been destroyed long ago or we would be slaves) but also one of justice, and man is being made to go through these horrors for the first disobedience. We did not create the evil which is destroying us, and neither did God. Also, there is no destiny. God knows which choices we will make, but we make our own choices, not influenced by him (unless we ask for guidance, where He can give us ideas which may change our entire future.) So, this is why we go through what we go through...this is merely justice for our disobediance.
~Chairman Kaga