I'm a little disappointed that no member has offered the counter view: she had doubtless suffered abuse as a child (the latest is she had brain damage), the death penalty is inhumane and brutalizes society as a whole, it's not a deterrent etc. I suppose the uniqueness of the crime, its barbarity and premeditation made it inevitable in a society which still retains the option of judicial killing that she would have been executed at some point. If I recall rightly it was the late maggie whose hero was Clive Stafford-Smith, and I know had she been alive she would have contributed to this thread.
How I would address these points:
First, the general points. I think the Americans (or at least, those states that do, as well as the federal system) are correct to retain the option to execute the worst murderers. We should also have it restored here, though I would want a requirement of unanimity in jury decisions and other protections to be restored along with it. It doesn't brutalise society. What brutalises society is the criminal act.
Keeping somebody in prison for decades on end is grotesque when that person grows into old age and is no longer a threat. It has left the British system with a dilemma and it finishes with Colin Pitchfork, double child killer, talented artist and baker of exceedingly good cakes, sat on a bench in Bristol city centre munching on a rhubarb and custard bake from Greggs while trying to remember that he needs to pop into Boots for a prescription. I would prefer that he had just been hanged in the first place. It would be a more dignified affair all round and provide finality to the families of the two victims. It would also have been kinder to him, actually. I never forget that he is a human being and that prolonged incarceration involves existential suffering that we should not be seeking to inflict.
Turning to Lisa Montgomery, one red flag for me when looking at this case is the hyperbole that her defenders engage in, using buzzwords, politicised arguments and exaggeration to make a case for why she, as a woman, should not be executed. They claim she was abused and was brain damaged, but there is no independent scientific or legal corroboration of this, to my knowledge. I stand to be corrected if somebody can provide links to actual evidence, not just third party claims.
Let us say she was abused and raped. There's no conclusive evidence that this ever occurred, but let's assume it is true. Even if it did happen, this is not an excuse for murder and it is not a reason to mitigate punishment.
She may have been brain damaged; again the only evidence for this seems to be the claim of her mother who inflicted the brain damage on her. Let's assume she is telling the truth. It doesn't follow that she could not form the necessary criminal intent. I accept that executing somebody who was without criminal intent in committing the act is wrong and would almost be tantamount to legalised murder, but to my knowledge, no argument was even advanced by her legal team that criminal intent was absent. Instead, they tried to suggest that her problems were sufficient mitigation to justify commutation. I've explained why I disagree with that: the premeditation involved in commission of the offence, and the brutality of the crime. She must have known what she was doing.
We're told she was mentally-ill at the time of the offence. (She was subsequently diagnosed with multiple mental disorders, but that's only after entering incarceration). I've noticed that 'mentally-ill' is a term that's now used with undue latitude for any sort of mental or emotional issues that a person can have, and I also can't help but comment on the irony of the tacit crude sexism in this mitigation point. Are we saying that women can't be mentally-ill without murdering somebody? Let's assume she was mentally-ill, we have no specifics to guide us, and again the same observation as immediately above applies. A mentally-ill person can form criminal intent. I sympathise with people who have these issues, but it's not an excuse for murdering somebody.
There may be an argument that women should not be executed on the traditional ground that adult females are more akin to minors in their mental, intellectual and emotional disposition and lack full moral agency. I'm not saying I agree with this argument, but feminism seems to advance the argument tacitly. The irony is that it is feminist jurists and lawyers who believe that women are constructive minors. That is essentially what they are saying when they appeal to chivalry and ask us not to support the execution of a convicted murderer who is female.
Where I do agree with her defenders is that her prolonged incarceration was a violation of human rights. I am, in principle, opposed to unnecessary prolonged incarceration. I regard it as cruel, regardless of what somebody has done. In the case of Jeremy, keeping him in prison into his 60s when he began his sentence in his 20s is, to my mind, manifestly cruel given that he is not assessed as a significant threat to the community. In the case of Lisa Montgomery, I think if somebody is sentenced to death following a fair trial and having had an opportunity to appeal and also ask for executive clemency, and assuming there is no remaining doubt about the essentials of the case, then the sentence must be carried out. The reason the U.S. system drags it out for years is due to the pressure of well-meaning but misguided people who are abusing the vitality of the American due process protections. That ought to stop.