If I were the victim of a crime, I would want to make a statement because otherwise I would worry that the impact that the crime had on my life would be ignored.
When criminals are sentenced, judges often hear about the special circumstances that have made the criminal's life difficult. Judges are told about how the criminal is poor or is addicted to drugs, or was abused as a child. These are all legitimate things to tell a judge in mitigation, but they ignore "my" feelings as the victim. If the judge should take the criminal's problems into account, he or she should also take into account the problems that the criminal's conduct have caused in my life.
Because of this, I would want my statement to be heard.