There is no dogmatic reason to oppose the death penalty, but there is an important practical reason to oppose the death penalty: .gov/.ZOG messes up… a lot!
Here's a false accusation that—Thank God!—ended well.
South Carolinian faced 115 years in prison until ATF admitted they got the wrong man
https://thegunwriter.substack.com/p/south-carolinian-faced-115-years
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But it has always been the case that an innocent man could theoretically be wrongfully convicted, and this has never been put forward as a reason to avoid the death penalty until modern times when people started trying to come up with reasons not to put people to death.