Without capital punishment (the death penalty) our lives are less secure and crimes of violence increase. Capital punishment is essential to control violence in society.
Capital punishment, a cruel and unusual punishment in the legal system, has long been an issue of controversy. While supporters hold that execution deters crime, opponents claim it is inhumane to deprive fellow men's life, whoever they are.
Admittedly, possibility exists that capital punishment may lead to miscarriage of jurisdiction by mistakenly executing innocent suspects. To make things even more complicated, political conspiracies have repeatedly pushed innocent victims to death in the name of jurisdiction. Take Socrates and Jesus Christ for example, both of them were imposed death sentence as dissents for violating the ruler's interest, but as is undeniable today, both of the two have made huge contributions to the human civilization.
However, these reasons mentioned above are inefficient to serve as evidence to abolish the capital punishment, because death penalty, despite its minor fault, plays a vital part in preserving the safe and security of the whole society. Not only can it ensure that the convicted criminal won't offend a second time, it is also regarded as the best "legalized revenge" to victims' family. The cost of life itself also poses as a threat to potential criminals, preventing them from harming the others. A society which imposes no more severe punishment than life imprisonment on murderers is one that perceives murder as a tolerable and unimportant issue, which is no doubt against human rights.
On balance, we can safely conclude that capital punishment is essential to control violence in society. But to render it more unbiased, related regulations need refining to ensure a more effective and judicative legal system.