When something bad happens to us, we are likely to ask God why he allows it. We feel that God is not being fair to us. We must remember that we are all sinners who offend God continuously, so we don't have the right to feel that nothing bad should ever happen to us. The fact that heaven and hell exist takes care the fairness question. Once we are in heaven or hell, all the things that happened to us on earth, good or bad, become immaterial. This is how I see it. Instead of complaining to God, We should be aware of our sinful status, trust in God's mercy, and live aiming for heaven.