Abolishment of death penalty?

http://www.amnesty.org/en/death-penalty?page=1

While browsing through Amnesty International, a humanitarian organisation, I stumbled upon this part of the website. Ah, that's fine, a human rights organisation opposing unjustified killings. I read on, and was slightly disgruntled by the stand that the organisation takes: "Amnesty International opposes the death penalty in all cases without exception regardless of the nature of the crime, the characteristics of the offender, or the method used by the state to kill the prisoner".

I do not agree with this stand to a degree. "Regardless of the nature of the crime". What if it was a psychotic mass-murderer, or the head of a world-wide criminal organisation, responsible for ruining thousands of lives? Think of all the pain that they have caused, all of the violations of other people's human rights, look the criminals in their eyes, and tell them that they deserve to live. Would you oppose the death penalty in those cases? I think not.

Having lived in Singapore from birth, I have experienced the results of strict law enforcement in a country. I have NEVER seen a crime in progress or been affected by any crime. Fact is, Singapore's crime rate remains low compared to other countries partly because of the strict laws enforced, and the punishments meted out. Other reasons include the almost non-corrupt judicial system and the small size of the country (making it extremely difficult for criminals to hide). Besides, why would you be given a death sentence if you deserve to be forgiven? Commit a crime of your own accord and you deserve no better than loan sharks or drug runners.

Then again, the death sentence can be abused to the criminal's advantage. Due to the corrupt justice systems in some countries, death sentences are brought upon the innocent, scapegoats for someone else's crimes. Because death is permanent, the case will not be looked into any more and the guilty will be acquitted. This is the sole reason why I may be (slightly) against the gallows.

If I were a minister of Singapore, I would support the death penalty. Not only does it keep Singapore safe, it is not as humiliating as public caning in schools or as cruel as being stoned to death. What about basic human rights, the denial to life? You may have human rights, but not a single person has the right ruin other people's lives and get away with it.