Heres some points:
-How can a government that condemns murder, murder it's citizens?
-There is the virtual certainty that genuinely innocent people will be executed and that there is no possible way of compensating them for this miscarriage of justice.
-A second reason, that is often overlooked, is the hell the innocent family and friends of criminals must also go through in the time leading up to and during the execution and which will often cause them serious trauma for years afterwards.
-There must always be the concern that the state can administer the death penalty justly, most countries have a very poor record on this. In America, a prisoner can be on death row for many years (on average 11 years {2004 figure}) awaiting the outcome of numerous appeals and their chances of escaping execution are better if they are wealthy and/or white rather than poor and/or black irrespective of the actual crimes they have committed which may have been largely forgotten by the time the final decision is taken.
-There is no such thing as a humane method of putting a person to death irrespective of what the State may claim. Every form of execution causes the prisoner suffering, some methods perhaps cause less than others, but be in no doubt that being executed is a terrifying and gruesome ordeal for the criminal. What is also often overlooked is the extreme mental torture that the criminal suffers in the time leading up to the execution. How would you feel knowing that you were going to die tomorrow morning at 8.00 a.m.?
-There may be a brutalising effect upon society by carrying out executions - this was apparent in this country during the 17th and 18th centuries when people turned out to enjoy the spectacle.
-The death penalty is the bluntest of "blunt instruments," it removes the individual's humanity and with it any chance of rehabilitation and their giving something back to society.