@layman,
The greatest power any person or entity can have over a person is the power of life and death.
Not wanting the government to have this power is not even close to saying no one should have any power.
The power to throw a citizen in a cell and throw away the key is pretty damned mighty, but I don't oppose it because the State must have some power to deal with terrible citizens and a life sentence allows for a lot of time in which injustice might be overturned. Once the State kills you, it doesn't really matter whether or not you are exonerated at some future date.
It's really not that complicated.
I understand the notions of retribution and vengence. I'm not arguing that the death penalty is barbaric or immoral. I am saying that it is foolish to allow the State to have the ultimate power over us and one that cannot ever be rectified if abused.
We all know it has been and likely will be abused in the future.
As well, the cost of incarceration vs the death penalty is an obscene consideration. We should kill people because it's cheaper than warehousing them? And if we should kill them, the fact that it's cheaper to imprison them should have no bearing.