Spiritual death, which came through man's sin, preceded the physical death of man. All people now sin. All enter life in a state of spiritual incapacitation. Life on earth has an eternal purpose. This life is roughly analogous to a school course with a final examination.
Physical death has a good purpose.
Suffering has a purpose. God is involved in our suffering. Innocence is available in Christ done. Human solutions fail to solve our problem. Punishment for sin is necessary for restraint and correction, but it is insufficient to eliminate sin.