Death Penalty

I am opposed to the capital punishment system. According to the textbook, capital punishment doesn't relate to the homicide rate. Murder is a crime of passion, because they can not think calmly about the punishment and cannot stop committing crime because of outrage. So, I think capital punishment is not meaning. In addition, the executioner receives mental damage, because everybody knows life is most important for us. If death penalty does not deter murder, we should abolish it and try to rehabilitate the criminals. So, punishment of long imprisonment is better than capital punishment. In conclusion, the death penalty is useless to stop homicides and it is an unnecessary thing. So, we should abolish it!