but must other unsuspecting people become their victims in turn? Where does it all end?
That's a good question. I suppose we both agree that it ends when the generational cascade of abuse is halted. The difference is that you find capital punishment to be a reasonable way of doing this and I do not.
I think we both agree that the punishment of one who was abused and became an abuser is a punishment for ancient, forgotten wrongs and is unjust.
But although I find the idea of apportioning a significant degree of blame to someone in this instance unfair, I don't think it unreasonable to incarcerate them to prevent them from doing further damage to others. I also think it of desperate importance to attempt to rehabilitate such prisoners. If rehabilitation is of limited efficacy, then serious money should be sunk into finding new and better ways. After all, the idea of getting a functioning member of society back at the end of incarceration has to be very attractive, even if the methods used aren't 100% effective.
That's where I believe it should end, and not on a trestle table with Velcro straps.
Now I know that figures are used as propaganda tools, and can be bent by the unscrupulous or idealistic. But like Super Nintendo Chalmers, I have read on anti-capital punishments websites that capital punishment, at least in its current form in the US, is costing significantly more than life imprisonment would. I personally would like to see that money sunk into improved rehabilitation, training and education for prisoners. If, like me, you reject the blame and revenge components of criminal justice as unhelpful then I think this is the only humane standpoint, though I am fully aware that it upsets some people.
It is not demonizing damaged members of society to wish to protect potential victims of those who are damaged. It is more in the interests of protecting the potential victims, who are usually vulnerable, law abiding citizens who simply wish to live in peace. Who should have priority?
I agree that the desire to protect potential victims is a priority. With this in mind, I don't propose that people be let out of prison before their sentence, withstanding normal parole proceedings, is completed. And I don't propose that people, unless in certain cases when the offender is judged to pose a serious enough risk to the population, should be interred for life (though I think every case should be open to review). I think that most people, having served their sentence, should be allowed another chance. I don't think that they should be allowed this chance, however, without the most diligent attempts being made to ensure that they will not reoffend when they are freed. This means serious money being spent on them to train them, to counsel them and to educate them. In this way I think the conflict between the potential victims and their potential victimisers is made less pronounced than it can be currently.
If, as you suggest, rehabilitation is next to impossible, what then? Do we roll over and leave ourselves completely vulnerable to people who are so damaged that they are beyond help?
As I have stated, I believe that those who could hypothetically be endangered by unrehabilitatable convicts are well protected by the indefinite imprisonment of said convicts. I believe that as a result execution is rendered redundant as a means of protecting potential victims.