Why did God break off Israel as branches from the olive tree?

Les explains from Romans 11 that Israel was pictured as branches in relation to the olive tree and its root. Israel did not appreciate that position, so God broke them off. The analogy is that when Israel rejected everything, God turned to the Gentiles through the apostle Paul and began to call out the Body of Christ. As He removed Israel from feeding on the root and the fatness of their father Abraham, He put the Gentiles in their place. Paul writes that if some of the branches were broken off, and thou, being a wild olive tree, were grafted in among them, and partakest of the root and fatness of the olive tree. Romans 11:15 also speaks of the casting away of them as the reconciling of the world, and their receiving as life from the dead, which Les connects to Ezekiel 37’s valley of dry bones and the nation’s future life.