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Death row inmates should be used for scientific experiments instead
Part of the constraints of capital punishments in modern society is that they are quick and humane. We don't torture people. Many forms of experimentation on criminals would likely be equivalent to torture and are inherently unethical because of the recurring harm they may cause.
Marxism is an inherently violent revolutionary ideology
Marxism has a long history of democide/genocide and violent revolutions that usually result in authoritarian totalitarian governments worse than what existed before.