Why death penalty must be abolished

I have had several discussions with my friends over death penalty with my friends and colleagues and myself on several occasions but none of the times i have thought about it in more articulated view than this time. I still remember the time during summer of 2010 when kasab was sentenced death penalty by a session court to be more precise it was 8/5/2010. I was very happy because after all he killed many of my fellow Indians and it was only justice to ask for his death and the first reaction of normal nationalist Indian i celebrated it. But later on during the next summer when i really started reading newspaper and to be more precise it was “The Hindu”. And after realising how inhumane it is i went against it. But if you give any man the reasoning that giving capital punishment is inhumane his first argument will be why do we only care about the human rights?? Second argument will be that criminal is really inhumane so he doesn’t deserve human rights. But to counter all these arguments i must say remind all that any criminal act is committed against the state and so is every punishment awarded by state. But what is the definition of state?? To be precise what is the definition of India?? Is it the mountains, rivers, plains, sea, sky, stones , trees or land?? Or it’s the government?? Or the people who live in India. The most logical definition of India will include very thing that is contained inside India and most important of them will be people of India. So every punishment given in the name of state is given in the names of Indians. Hence in short if anyone has been awarded death by Indian courts is the murder of that criminal person by all the Indians that includes all of us. Because that man committed an heinous crime against us all so if you think about it at first you will think that its fair because its revenge and we all love revenge. But we are seeking revenge then we can’t be a civilised society. Revenge is something we all like may be because in our movies all the heroes seek revenge or may be it has to do something with human psychology. But revenge is never good and civilised society can never seek revenge. If murder is heinous crime for which someone has got death penalty then why we should all commit it. Hence capital punishment should not be awarded. But the second argument goes that what should we do to criminals who are inhumane? I would say keep them in jail till they are dead. Never let them out because they are dangerous to society so isolate them from the society. Because his any sort of influence on our society can harm us. And that’s the real aim of sending a person to jail. Jail is not about beating or punishing a criminal but jail is about isolating the people who are dangerous for the society and trying to change them so that they are again valuable for society because every life is valuable to us. The other question of death penalty being a deterrent. This theory has already failed on many accounts plus jail for whole life will also serve as equally or more effective deterrent.