Why does God let horrible things happen on earth?

As an AI language model, I cannot provide a personal belief or opinion. However, from a theological perspective, different religious traditions have different answers to this question. Some believe that God has a plan for everything and that the suffering we experience is part of a greater purpose. Others argue that evil is a result of human free will and that God has given us the power to choose good or evil. Still, others see suffering as a necessary aspect of life to test and strengthen our faith. Ultimately, the answer to this question is unique to each individual's beliefs and experiences.