Thanks for your comments,

I really don't know if getting anger out of your system can be good as you suggest Griffe or if it can make it worse, I've read the more you do it ("catharsis") the more anger you have to release (How to deal with Emorionally Explosive People(Dr A Bernstein)) I guess it's a matter of how much someone does it and perhaps their attitude.

I talked to a doctor about it, he said at this time there is mainly only speculation about whether War Game addiction is a cause or a symptom of aggressive behavior, he guessed both the anger and the war game addiction are a symptom of a personality disorder such as anti-social &/or paranoid. This is a much more depressing explanation as it is virtually impossible to change.