You mean the same conscience that exploits people in other lands?
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It bothers me to no end when such trivial issues as the rights of monsters are debated while the rights of angels are trampled upon. A million claims to the goodness of our heart, a billion examples otherwise. We have a problem in this nation and it's not the death penalty, it's the life penalty. There are those who suffer because we release prisoners back into the mainstream. To argue against the death penalty may sound reasonable but, without a reasonable alternative, it is merely internal politics that are distracting from external atrocities.
I most certainly don't disagree with your priorities, but can these external atrocities be so easily separated? Isn't it all just the same same lie of "impartial" righteousness, allowed by societies whose justice/governmental system encourages atrophied consciences and defines all that is "bad" as "other". Certainly the harm does not even come close to comparing but it is my opinion that the one provides a supporting infrastructure for the other. Not in terms of causation, obviously, but the mindset is identical and the corelations are strong. If it can be removed at any level, it should be.
And for starters, people should lose the idea that rapists and murderers are monsters. They are human. Rape and murder is human behaviour. It is very easy to identify 20th century propaganda which represented the Japanese or the Jews (or even Muslims currently) as sub-human as ways in which our societies allow acts against those groups which would not normally be permitted, but it is actually a harder task to accept that the people who commit the most awful crimes are not "other".
Sex crimes, for example, are commonplace. Statistically, it is pretty much guaranteed we all know, and are possibly even friends with, someone who has committed one. And if it becomes known, it shouldn't be "shocking"
because they are part of our social group. That is always how it is. It is denial of this very unpleasant reality which makes people feel "righteous" and the government simply mirrors this to us on a larger and more global scale at the same time as it feed it and feeds off it.
In my opinion, any place where this detachment and denial can be cut out of society, it should be. For me, it has absolutely nothing to do with the rights of criminals. In cases where I know the facts (and that is a far more stringent requirement than knowing the "verdict"), I can make my own judgement on the value/harm of that person continuing to live. In all other cases (ie; virtually all of them) I am not prepared to entrust that judgement or that power to an entity which is greater than the sum of its parts.
As for an alternative, there is an extremely obvious one, and one as old as time: Ostracism.
Obviously, we are no longer able to cast people from our communities without inflicting them upon others but a life sentence (and I mean an
actual life sentence) serves the same function. Do I care if some are murdered in prisons or become more hardened? Not particularly, because in this case my assessment of all the corollary arguments (ie; cost/wrongfully convicted/ etc) is less than the benefit to society.
But any position which grants the government the right to execute as punishment, no matter how complex the codified restrictions are, is a sacrifice of individual conscience and individual responsibility that I don't believe any populace should consent to.