That the law must reflect the unique awfulness of the crime of murder with a unique punishment. Current punishment is not inherently different from property crime or assault. It should be.
As regards mens rea, I mentioned legal anomalies such as the GBH rule, and these could be removed without any trouble. They're not an argument against capital punishment, merely English murder law in its current form.
Peter Hitchens agrees that deterrence is debatable: in his book A Brief History of Crime he admits that the deterrence argument hasn't been proven either way, and suggests an experimental reintroduction of capital punishment for a period of five years. I don't agree, but not the words of a man whose mind is fixed.
You are of course right to say that the law could be altered so to draw a distinction between premeditated and unpremeditated murder (effectively, introducing 'degrees' of homicide) and if you support capital punishment for premeditated murder it does make sense to do so. But I don't.
I don't accept the argument for placing murder in a qualitatively separate category from other crimes against the person. I don't see such a huge moral gulf between killing a man and beating him so badly he's left blind, brain-damaged and in a wheelchair for life as to justify that. Nor am I convinced that the death penalty is any more awful than a life sentence.
I see no evidence that wrongful execution encourages police malpractice. If anything the reverse is true: would Derek Bentley have become a cause célèbre had he been gaoled like his accomplice? Very doubtful. Imagine the outrage if the police had got 11 people murdered. Ruling confessions not made in open court inadmissible in murder cases would prevent another Guildford Four. (Already very, very unlikely post-PACE.)
I did say I was speculating, not advancing a hypothesis for which I have much evidence. Nevertheless, it makes logical sense and it'd be interesting to look further into. Policing has not always been of a high standard, and plenty of cases have come to light of shoddy police work putting people inside on convictions that were unsafe at best. One wonders how many more could come to light with some serious research.
Derek Bentley I think is a rather poor example to use against it, since his execution came at a time when the death penalty was controversial and it was accordingly seized upon by the anti- campaign. It would be more instructive to look further back to when the death penalty was more routine.
I'll address this one separately as I take it very, very seriously indeed.
As I said, I place so much importance on this point that it led me to support condemning guilty men and women to spend up to 80 years in a concrete box. As you know, I'm a passionate supporter of civil liberties, for the very reason that I find wrongful conviction abhorrent.
If I don't oppose killing by the state in principle then the only question is where do you draw the line. I see upholding the sanctity of life to be of utmost importance. The gravity of murder must be atoned for with the ultimate sacrifice. And practically, how long will the wrongfully convicted be gaoled before the damage is irreparable? Thirty years? Forty? Is it humane to intentionally gaol a repentant murderer until his nineties to remove the possibility of wrongful execution? If you follow the logic of this through, then our entire penal system must be geared to minimising the damage of wrongful conviction. Prisons should be secure hotels with conjugal visits and creature comforts.
Intention is everything. The law itself places huge weight on it (in demanding mens rea for a conviction). Wars kill and maim innocents, but I support defensive war provided there is no intention to kill civilians, and every possible step is taken to avoid their deaths: executions after a due process packed with procedural safeguards are far, far, far less likely to kill innocents. How can I support the first and not the second?
Since I can't accept the moral argument that murder is so different from any other crime that it requires a completely different punishment, I don't really accept this.
The idea that by killing someone you uphold the sanctity of life strikes me as a very odd one. In fact, the phrase 'like fucking for virginity' comes to mind. It just strikes me as illogical, unless meant in the sense that it deters murder, and we've already been over that! As for where I draw the line on the state killing people, well, I can see no good reason not to draw it at the state not killing people in cold blood. Accidental deaths are one thing; deliberate killing is another. As you say, intention is everything.
It doesn't actually concern me much that prison is arguably more cruel than hanging someone. You argue that the death penalty is the ultimate sacrifice: I'd suggest that a life sentence is probably worse. Indeed, if I'd committed a murder personally I would actually rather hang than serve a life sentence,
if I were guilty. If not, at least I'd have some chance of clearing my name. A long prison stretch does do permanent damage, I'm sure, but better that the state can apologise to me and offer some compensation than handing a posthumous pardon and a 'sorry, we got the wrong man' to my next of kin.
Nor do I think that withholding the one form of punishment for which no restitution at all can be made to the wrongful victim, and whose benefits are highly debatable at best, means that the logic of the entire legal system has to change. Why should it? We don't allow most police officers to carry lethal weapons, but that doesn't mean they cannot use force at all. Is the law not based on many such compromises between principle and practical concerns?
<e2a> In the end, we're talking past one another here. You're arguing an essentially moral case: I don't accept a lot of it, but nor do I have a strong moral position against capital punishment. I do, however, think that the practical case against is damning. Ne'er the twain shall meet, I suspect!
@rachamim18 - Don't bother. I've no interest in trying to engage with you on any level.