So if he knew and chose not to intervene did He not by His lack of action predestine it to happen??
Yes, He allowed them to happen, but those who did are the ones responsible since they chose using the gift that God gave them free will which is (to go against Doc's determinism again) an uncaused cause.
When God created rational creatures He did something that would cost Him dearly (but He was willing to pay the price) He brought into the Universe creatures who could say no as well as yes from no other source but their own will. Love demanded this, if God was to get the pleasure He wanted from His creation. God is not afraid of free will as Calvinists are. God knows He is Sovereign and has created His plan with Free will factored in. God will accomplish what He has decided to accomplish and the price He is willing to pay to do so is represented by the Cross. It is Calvinism that belittles God's greatness by limiting His ability to reach fallen man and give him a choice to accept or reject Him. How much more simple it is just to say 'God chooses who He will and leaves the others'. God is far more wise than that simplistic, nonBiblical approach (Rom 11:33-36) The God of Augustine and Calvin far too small to be the God of the Bible.