The government-sponsored killing of individuals is wrong.
Often people who do wrongs things can be "sick", as you put it, and do truely abhorrant things. This is no reason to kill them, just because it is too hard to try cure them. Mental illness should not be ignored.
As to the Death Penalty, this is wrong. I would much rather see the person imprisoned for the rest of his natural life. While there he is provided with food, water and shelter and is made to work for 8-10 hours a day to pay back his cost to soceity. If you kill him how is he meant to pay us back.
Additionally, what if you kill someone who is later proved to be innocent, due to faulty police work or newly discovered evidence or a subsequent confession. How can you repay the families for their loss.
No Justice system is perfect, so why deliver such a final solution to the crime.
BTW: I think in the US, at least it has the concept of a "Death Row", whereby if some new evidence or confession comes to light there is the right of appeal to the Governor. This is not a bad compromise, in a country where the Death Penalty is accepted as the norm.
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