Taxi you can't use the word humane when talking about ending somebody's life against their will. It is oxymoronic.
Oh I know you don't want to die, but I'm going to murder you anyway.. but painlessly, so that's ok.
The only way I can see that killing and humane can go together as words are in euthanasia. If they're in agony and they ask for it, then you could say it is an act of mercy.
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But with opinion on the death penalty, whether you are pro or anti, you should stick to your principles, because if you don't then you really have none. Whether you know or love a victim should have no bearing on your decision. Being anti the question is always "What if it was your wife, or your child, or someone you loved that got killed?" So basically the question is "Where is your desire for revenge?" As if revenge is this great quality we all should have.
If we all had guns and a bloke walked into the pub and put a bullet in your wife's head, you'd probably shoot him dead before you realized how sad you were. He murdered your wife, and now you've murdered him. Congratulations. I think we are astute enough to realize that we act impulsively and that it isn't always in our best interest to do so.
For me the right to live is the same as the right to die. I don't believe in killing someone who wants to carry on living, and I don't believe in keeping people alive who want to die.
If these broken-minded murderers come to the realization of what they did, have remorse, and want to end it rather than spend the next 40 years in prison, then we should let them do it. Give them the poison gas mask to put on themselves.