It is very disturbing sometimes to think that people could become obsessed with something as horrible as violence. It is horrible to think, but it is true. Usually a person is brought into an interest in violence through some form of anger or an event of anger that happened and shocked them. This turn of anger could be from mimicking a person that they know. Maybe the person grew up around a ton of anger and that anger rubbed off on them. It could be that the anger spawned the idea that violence is ok. Regardless of what the reason was it is the type of situation that involves very delicate healing. Professional help is usually the best way to go about this particular situation. If you try to go about this immediately without any help you could risk causing more damage to the person than you had intended it to cause.