I for one think that the state isn't paying enough attention to the accused people, that are supposed to get the death sentence. By this I mean that every criminal that could potentially be sentenced to death needs to be, at least, thoroughly examined on a psychological basis. If said criminal is a psychopath/sociopath, it's obvious that they'll never be able to change, and if they're set free once again, they will commit the same crime (which is usually homocide), again.
If said criminal is, for example, simply a middle aged man with anger management issues whose wife pushed him to the very limit and made him kill her, or an alcoholic who beat his someone to death when he had a bit too much to drink, he/she shouldn't get the death sentence, in my opinion. I believe those people can change, especially after enough time in prison.
The ONLY time I'd support the death sentence is in the case of psychopath/sociopath murderers, as those people really are nothing more than a threat to society, and they WILL kill again if they are released. And there's no point in keeping them in prison forever, feeding them and generally keeping them alive, when it's much easier to just hang them on a piece of rope. And again, I only support it for the safety of other people. I do not in any way think that the death sentence is an appropriate punishment for ANY crime. No one "deserves" the death sentence IMO, and it should only be used as a safety measure in cases when there's really no other alternative (I don't count a lifetime in prison as an alternative, better to be killed right from the start than to have to rot away for the rest of your life in a cell.)
I say people should die. In large numbers. Not necessary because they committed a crime or something.
The world's population keeps growing. And that sucks for the planet we leave in since more people means more resources must be used, more forests must be tared down and more animals will eventually be slaughtered (for food or just for some idiots fun). Not to mention the growing pollution in this dieing planet's atmosphere.
There's a much better alternative to what you're suggesting. We humans are mortal beings. We'll all die eventually, so isn't it much easier to just reproduce less, or not at all? FYI, there are still people who have 8-9 children per family in some countries. If they had, say, 1 or 2 per family, we'd be getting somewhere. Although I'd personally like it if we'd stop reproducing altogether, but I'm aware we'd be taking an enormous beauty from the world, and that a lot of people wouldn't agree with me at all.