If everything is predetermined, then we humans have no freedom and can blame God for all the bad choices we make. But, if God allows us freedom, then we have to take some responsibility for our actions. Secondly, God is self-limiting to allow the laws of Nature to exist. Human knowledge could not grow if there were no laws of nature. Neither moral character nor scientific knowledge would be possible if God intervened frequently to save us from suffering.
Natural laws are the reason for cancer and earthquakes and other disasters.
Thirdly, we could not grow morally if God did not choose to limit his actions. Without danger, temptation and suffering, we could not develop moral courage. And the suffering of others calls forth our sympathy and love. Some process theologians take God's chosen self-limitation even further. Most reject creation out of nothing, and view the universe as being in a continuous state of creation - a continual bringing of order out of chaos.