Human mind and psychology is effected by what it sees. Although meant for entertainment, the FPS games and movies showing gun violence do effect the human minds subconsciously. In FPS games and movies, the characters are portrayed as heroes which inspires people to follow suit.
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In the wake of recent incident in New Zealand and shooting activities in the world, the time is high to ban any violence on screen. A lot of these games and movies are followed by children who can make wrong choices when they grow up.