Well, I'm also WoW player. And I like even more violent games.
Carmageddon like. Or Road Rash. Still, I have no intention on intentionally hurt anyone on the road.
Also, I like Far Cry. And Borderlands. I have no intention of blowing somebody's head off. Not in real life.
Am I also unfit for my job? And for my neighbourhood?
Do I really need to point out that I'm a expert in my job, respected co-worker and often sought company?
My colleague plays Call of duty and Medal of honor. Other one plays World of tanks and World of warplanes. Are they unfit for their job too? Shoul they be put in jail, just in case?

So what (and if) someone plays something is personal choice. Declaring someone unfit for something is pure bullsh*t if it's based on gaming preferences.

Statement "killing stuff without going to jail" is often on my repertoire. And NO ONE misunderstands me! Everybody understands that I have to vent steam out and that I have to reduce adrenaline levels. Not on streets. On my PC!