The implementation of the death penalty itself is vengeful and barbaric. Accidents in enclosed spaces lacking oxygen provide plenty of prior art for killing a

The implementation of the death penalty itself is vengeful and barbaric. Accidents in enclosed spaces lacking oxygen provide plenty of prior art for killing a human without panic nor suffering. I believe certain drugs such as morphine in high enough doses would also induce death with minimal pain. Yet the state-sponsored murderers still use barbaric methods. Even in states where the "gas chamber" is a thing, cyanide is used instead of inert gases such as nitrogen, despite the latter surely being cheaper, easier to procure and safer to handle for the murderers and the rest of prison staff.