Wars are fought in the GTA universe.

Refracted on the edge of the dim bubble, where the outside was rendered in the most realistic simulation he had seen yet, there was a character named Trevor who was a very unrealistic man, but, luckily for him, he was real this time. That's right, he was a living being, not a 3D rendering of one in its place. This was nice because Trevor has super powers in his game, and of course he was given the same powers in real life. Trevor gained much from fighting the AI. Yes, that he's becoming a very good shot. He can kill many before tiring. Of himself, he fears most the monster within. That's because he was clearly not plotted with full human intelligence by the writers of the GTA series. He has deep and serious flaws as a human being. But Trevor had to fight. That's because --"Wars are fought in the GTA universe." He saw the headline. But did he really need to take action to escape the page?

Trevor knew of wars fought and died for, in a simulated universe most called reality.