What type of psychological problems may lead someone to kill?

1-Most murderers are neither serial killers nor mass murderers. How are we able to combat the problem of murder when a person may kill only one time?
2-What type of psychological problems may lead someone to kill?
3-The criminal justice system provides very long, lifetime, or death sentence to those convicted of murder. Are these harsh and punishments appropriate for the crime of murder?
4-Are there alternative punishments for murders that do not include long incarceration periods or death?

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