Perhaps it is a good thing to be disturbed.
Earlier this semester, I had shown my roommate actual footage of insurgents being taken out from the air. He was a bit disturbed, but later that week when he bought Modern Warfare 3, he was more disturbed at how similar it was- and for the first time felt uneasy about pulling the trigger in a videogame.
For a different anecdote, my father and I were on the highway, and we passed by a crew tossing animal corpses into a flatbed truck. Unexpectedly, to see them lifelessly thrown as such, was a bit disturbing to me. I mentioned this, and he said he was glad- he had been worried that violent games had desensitized me and was simply glad to see a "normal" response to gore/corpses.
So, what exactly is the downside of an extremely realistic game? Is it that we could actually be traumatized? De-sensitized? Or simply that the game would be less marketable with less people wanting to expose themselves to it? Maybe the game would actually be more marketable with people lining up to play it. What if it makes people realize what war actually looks like, and feels like? Would the next generation be less willing to go to war? To kill non-digital people?