Capital punishment is essential to control violence in society
It's undoubtly true that without the severe punishment, people will stay in an unstable and unsafe environment and the crimes will grow eventually. A certain leve of punishment is essential to restrain the violence and crime, my own view that punishment shall be arranged by the nature of crime and less bloody.
Crimes deserves punishment as we all know, in ancient china, when people commit severe crimes, they will be hanged or beheaded regardless the nature and type of their crimes but the judgement by the local officer. In nowadays, most people will consider it as a primitive or bloody way of punishment. So under this civilized society, we shall put into consideration about the proper punishment for certain crime.
Another reason is some crimial aren't real crimial, they are either having mental disorder or a very personal reason for the crime. For example, a husband in north part of china faked a government chop so that his wife can get treatment for free in the hospital. After 10 years, his secret has been exposed. The hospital sued him and want to put him into jail, however, some voices support this husband because they believe that he did it for good deeds and helping his wife get medical treatment. So a modest and more human way of punishment is more reasonable.
To conclude, I think punishment should always be there when crime is made. Punishment shall be fair according to the nature of crime.