Killing an individual for extreme transgression against social norms of behaviour.
1994 data released by Amnesty International ranks the Islamic Republic of Iran the second in the world when it comes to the number of executions in a year. According to the same report, the Islamic Republic of Iran is one of only five countries in the world that have used capital punishment against the children under 18 years of age.
Capital punishment is threat enough to prevent some people from committing similar crimes.
Capital punishment doesn't deter others form committing similar crimes.