u/Acceptable-Whole8348

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So I was watching the sororitas episodes, and that got me wondering, what exactly prevents a mortifier or penitent engine from just committing mutiny or get revenge on their captors ? After all heretics and traitors are mainly put there, so you'd think they would be down to kill them, and from my understanding they are the ones controlling the machines, they are just in immense pain and suffering doing that.