But this issue has been debated for years, it's not like there are any drastically new arguments. We pretty much know that as a societal policy, the death penalty doesn't help at all. It doesn't lower murder/rape/etc. rates. It doesn't save taxpayer money. It doesn't "solve" anything in society (which, again, is what government policies are in theory supposed to be about)
So if killing someone doesn't actually solve any problems on a societal level, why should anyone support it as a societal policy? Life imprisonment, while not puppies and sunshine, at the very least accounts for the very real existence of wrongly accused people. And life imprisonment also accomplishes the goal of keeping a dangerous person away from the rest of society.
So this goes back to my initial point about who/what is the death penalty (as a government policy) actually supposed to be for? If it's only for the grieving family, that's pretty much the textbook definition of vengeance (government sponsored vengeance, I suppose). And if we support it because "fuck him, burn him at the stake, should've been in more pain, no fucks given", then that's government sponsored bloodlust.
How else am I supposed to describe it? Again, we're talking about government policies, not individual feelings. I totally understand why people have those feelings, and I'm not even saying those feelings are wrong (they're perfectly valid, actually). I just don't get why we want those raging feelings to be government policy.