And I will reiterate: zombies and vampires are the current rage among the teen through 30 set. (Heard of Twilight? Abraham Lincoln, Vampire Hunter? ZombieLand?).
As far as the game aspect, note the outrage Wayne LaPierre created when he suggested that video games should be blamed for violent behavior, and regulated. Some of those who were very vocally upset over this were younger TFL members, at least a couple of whom are now anti-NRA.
If you want to win over undecideds, then acting in a judgemental manner toward their chosen entertainment forms seems an odd way to go about it.