1st person shooters, or video gaming of any type, have no long term impact on violent behaviour. This has been confirmed over an over.
The few studies that have been done that did show a link, usually sponsored by anti-video gaming groups, academics have later said the methodology of the research was deeply flawed, due to for example lack of peer review.
Video games are no more harmful than reading a violent book or watching a Tarantino movie, anyone saying otherwise is just deluded, incorrect, or just making up excuses for failings elsewhere.
Biting the hand that feeds IT
