I honestly don't think it's any different from any other video game... it's true that I don't understand why people want to play realistic war-type games, but people also don't understand why I play fantasy-style games which also have characteristics of war in them (fighting, killing, tactics, etc). The graphics aren't the same, but the concepts are. I don't think what you play as really takes away from the fact that it's still about killing and conquering, or protecting, or one of those themes.
Whatever floats people's boats I guess.. I'm not one of those people that think video games really affect society much, other than becoming addictions.