There was a fascinating program on TV, back when TV was a thing.

There was a university professor studying psychopathy.

One day he tested himself. It turned out he was an extreme psychopath. He was married with kids, but after the test admitted, while he loved his wife and kids, he had no moral or empathy about killing them. What stopped him was society and the thought of spending the rest of his life in prison and that he actually liked his wife and kids and wanted them around.

He admitted he was no danger to anyone, but was very open about stating he had no issuing harming or even killing someone. He was a highly intelligent, self diagnosed psychopath, that chose not to do harm because he had a very comfortable and enjoyable lifestyle.