If their punishment fetish is what allows them to be ok with potentially killing innocent people, then they deserve to be next in line. They are no different than those they want to punish. I don’t even think punish is the right word. Executions would be vengeance. They have that fetish because they think of themselves as righteous, good people. They are not. People who support the death penalty are no different than medieval peasants cheering on the gruesome torture of a “criminal” like its entertainment. That is sadism. They can not be the good person they see themselves as and be sadistic at the same time. They just love to feed the sadistic part of themselves. I just try to get them to be more introspective, and that if their goal is to be a rightous person, they need to stop feeding their own sadism.