There is no rational, demonstrable, or defensible reason for a compassionate God to allow any of that. The excuses you will hear for it are either illogical, contradict known facts, or require wildly implausible assumptions for which there is no evidence.
Why would a god allow such suffering in this world? Why are there people with crippling, painful disorders and diseases?
The Atheist Perspective
What is your standard of truth? How do you determine what is true?
If god is perfect, how did he manage to create imperfection?
By what means or method do you check that what you believe is true, is true?
Why are all terrorists Muslim?
Would it be immoral NOT to kill a baby if god commanded it?
Atheist Hitler Homer Bible Christ: The Historical Papers of Richard Carrier 1995-2013 Richard Carrier Atheist Not the Impossible Faith Richard Carrier Atheist Humanism: A Very Short Introduction Stephen Law Atheist Atheism: A Philosophical Justification Michael Martin Atheist Why I Am Not a Christian: Four Conclusive Reasons to Reject the Faith Richard Carrier Atheist The End of Faith: Religion, Terror, and the Future of Reason Sam Harris Atheist The God Delusion Richard Dawkins Atheist God Is Not Great: How Religion Poisons Everything Christopher Hitchens