@DappledOliveGroves
Oh well, never mind my Oxbridge degree, MSc and law career - I must accept I'm not the brightest because I hold a differing opinion

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You are of the opinion that the correct thing to do is to kill a woman who'd had a psychotic break after a lifetime of torture and sexual abuse at the hands of those who should have been looking after?
This is despite the fact that the death penalty in the USA is shown to be ineffective at deterring crime, as well as costly and impractical. So, even if you disagree with the stance that it's inhumane, it's fairly obvious that it serves no real purpose other than to exact vengeance, which is not what the justice system should be for.
You could take me around any category A prison in this country and show me people who I'd quite like to see dead. At least, that would be my initial, emotional response. However, the law does not exist to pander to my emotional reasoning. There would be no point to killing this people, no matter how much you or I may hate them, because it wouldn't achieve anything. I would support longer sentences for many crimes and I would support life imprisonment, for I believe that many people receive disgustingly short sentences for their crimes when they are clearly a danger to others. But I can see no real purpose to killing them.