COD has more going on then "killing arabs". For that matter, which COD would you even be referring to anyway? There is more then one, and most of them have to do with before the Gulf War period on up. Many are based around World War 2 and Black Ops was dedicated to the Cold War. The Modern Warfare titles involve more then just Americans and "arabs" as you put it. I honestly don't consider pc gamers as the people who shopped at EB games in the early 2000s. Thats when I jumped in on pc gaming, and when EB was still around pc gamers didn't really shop there much, and the pc game selection was relegated to a few small racks. During the 90s EB did actually cater to Pc gamers though quite well, I remember their huge game selections and them selling pc hardware, but they catered to all the consoles about too and felt more like a specialty store for gamers and less like the game section at a Wal- Mart.
After 2000 it was more for casual people who just bought whatever, or people who did not have access to online shops, Newegg, Best Buy, Comp USA, or Circuit City. EB games stopped being a "legit" game store for real gamers around the time the Dreamcast experienced its demise anyway. The Gamestop buyout was just the nail in the coffin for them.