The reason we have the death penalty is because society has deemed some people’s criminal acts as worthy of killing them, because of some “they did bad so they deserve bad” mentality, and I guess as an incentive to not commit crimes(though this has its problems as well), because other reasons for this aren’t really rational. Death row is more costly, so “cheaper” flies out the window.It’s really based on the two reasons I stated at the beginning, which isn’t much, and Unicorn Chemistry Because Murder Is Wrong Hot Shirt there are active reasons to not have the death penalty, and is why not all locations do.We humans are very social and very intelligent animals that have empathy. Which means we can empathize/sympathize with other people (and with other species as well) who are suffering, laughing, feeling anger, etc. because we have the ability to “put ourselves in someone else’s shoes.” Also, when you help other people and treat them with kindness, they in turn (or somebody else) will do the same for you.
Likewise if you hurt other people and treat them badly, again they in turn (or somebody else) will do the same to you. When you and other people maximize happiness and pleasure to other people as much as humanly possible, nearly everyone benefits from it in some way, shape, or form. This has NOTHING to to do with a belief or lack of belief in deities or souls, nor is it contingent on whether gods exist or not, nor does it have anything to do with so called “karma.” This applies to Unicorn Chemistry Because Murder Is Wrong Hot Shirt theists as well.On a per individual basis, morality is very subjective and situational. On a population level, nearly everyone will agree that senselessly killing/raping/stealing from people is wrong, and that if everyone on the planet did this to each other all the time, then society would collapse and we would go extinct due to the level of complexity that human society entails. This is why we have systems of government and law enforcement that basically say that in order for you to enjoy the rights and privileges in a functioning society, you will not break these societal rules, but you will follow these societal regulations. Otherwise there will be consequences, whether in the form of imprisonment, exile, or death.