While it probably doesn't directly incite violence in well balanced individuals, it does in my opinion trivialize war and glorify armed combat.
I'm reminded of that French soldier who "cosplayed" Ghost from Call of Duty while on duty in Mali.
I guess it's not really new, literature always told stories of war and it's an extension of that, but a book and a game are not the same thing.
I wish that was what the discussion was about, instead of this dumb tabloid-tier "Doom creates serial killers" narrative.