First of all, there is no one has the right to get other people’s life. People are born by God willing and God is only person who has this right.
Human beings should not kill human beings. Even if criminals have committed horrible crimes, the government does not have the right to execute them. Taking those people into prison is a good solution; because this is a deserved punishment for their crimes and this kind of punishment is much more humane than capital punishment.
This type of punishment is strong enough to make scare in criminals' minds.
Furthermore, most criminals have committed crimes when they cannot control themselves or they cannot think about the consequences of their own actions. In fact, many people have committed crimes when they are angry. For example, I read a story about a woman who killed her children by herself. She loved her children, however her husband left her and lived with other woman and did not care of his wife and children. She though that she would kill herself, she wondered that who would look after her children when she killed herself, and she decided to sink at river with her children. Unfortunately, she was saved, while her children died by herself.
Now I ask you a question. Will it correct or right if government uses death penalty for her.
However, other people believe that using capital punishment ensures safety for societies. In fact, we can see that the number of crimes is rising in some countries although many criminals are punished by death penalty and this kind of punishment cannot stop crimes.