The wanting to torture and kill people is psychotic. I want opinions on what one of these psychos should do. Do as in mental, psychological, or emotional help. How can any potential damage be prevented? The psycho has no intentions of killing himself.
You sure that this person is serious? I also have few people that I would want to torture for destroying my country and I would do it but I also know that this is beside my reach. Does this person was aggressive, had problems with self control?
As you said you were to meet the doctor so he probably gave you some piece of advice. I can only tell: find hobby, try to make yourself busy. Do you feel empathy? If yes then try to find a pet to care for him maybe it will help you