Lifers in prison, after some time, grow to like their existence, especially if they're wired to do the kind of things to get them there in the first place.
You know the time is right to take control, we gotta take offense against the status quo
Originally Posted by A. de Tocqueville
Yes, it works the other way as you suggest, but the issue is whether the downsides of the death penalty outweigh whatever positives. I don't think there's an objectively correct answer to that - it depends on how badly we want to avoid innocent people dying, or agreeing to a plea rather than face potential death. If revenge is more important than those admittedly few innocents, the death penalty might be fine for you.
I see the whole process as arbitrary, and prone to error, and political ambitions, etc. and believe it should be abolished everywhere.