I find this kind of hard to believe. Sometimes I watch ID channel and a while back, there was a case of a woman that was really the mastermind (ringleader) of a murder committed.
She somehow got a lover to commit the crime for her. Initially he didn't want to do it but she kept insisting and literally told him that if he really love her, he would kill the guy and he did.
In another case where there was a crazy couple killing and torturing another girl. It was really the girlfriend that was doing the shooting and the torturing while the man was an accomplice and just being there for her.
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Yes. People can somehow brainwash other people into committing crimes. There was that case I believe Charles Manson or I don't remember his name who also convinced people to kill for him.
There are many cults that brainwash people into even killing themselves.