I hate it when people are trying to present games overly significant in the context of history, culture or lifestyle. Yes, video games are now a part of many people's lives, but condemning games for omitting the Holocaust from WWII FPSs is almost the same as condemning them for too much violent/sexual/racial/whatever content. What people tend to forget, is that these are video games, they are a form of entertainment, aimed to be fun.
Yes, the Holocaust was terrible. My grandmother, who is also Jewish, experienced it first hand, the Nazis made her work in a German factory, and at one time, she almost got executed. It was horrible, it's a pure miracle she lived to tell the tale at all. But I don't think the Holocaust belongs in games.
Call of Duty is a game, and as one, its essentially the same as Dungeons & Dragons, Civilization 4 or that old supermodel Barbie game. These games are presented as they are for a reason. And that reason is being fun. Too much realism is not fun. Just think about it, we are trying to escape reality when we sit down to play a video game, to get our minds off of the real world problems, not to get even more.
Just try to picture Call of Duty with total historical accuracy. First, the game tells you, that you can't exit until you finished all the missions. If you try, your computer gets fried. So it begins. In the first mission, you play as an American soldier James Horner, D-day, you land on the beach of Normandy, and when you step out of the amphibious transport, you get gunned down immediately. Game Over. If you restart, you get gunned down again, without even firing a shot or catching a glimpse of the enemy. In the next try, you try to run to cover but you get blown to chunks. Next you get killed by friendly fire from a guy behind you going batshit insane...etc. In 80% of the time, you don't even get the chance to see battle. When you go from air, 50% of the time your plane gets blown out of the sky before you reach the landing zone, and you go down in flaming bits. But if you manage to jump, either you land on a tree, in a German outpost, in the water, on a roof...or your parachute won't open, either way you get killed 50% of the time even before you get a chance to aim your weapon. In the next mission, you dig yourselves in with six of your fellow soldiers who you managed to find, because you landed far away from the drop zone deep in enemy territory and there is no real hope you find your unit, so you dig in and wait hopelessly for backup, when the artillery shells begin to rain, and you are all killed immediately, but not before you witness all your comrades getting blown to bits screaming in agony. The artillery belonged to your army. In the next mission, you find a concentration camp full of morbidly skinny, weak, suffering men, women and children, crying, begging you for food and water, asking you where their relatives are, while they are stumbling over they fallen comrades' rotting corpses who the Nazis managed to kill before they left the rest of them to their fate after torturing them for months even years. The view is unbearable, every pixel on the screen yells for help, and the game tells you to "proceed to next objective", because there is nothing you can do for them. In the next mission, you play a German civilian Dominik Leiter, you enter the game only to witness a British bombardment destroying you home, killing your wife and child in it, and you barely manage to escape with your life. As you wander the ruins of your hometown, you see your entire life in ruins, mutilated, burned people and debris all around, the injured are screaming for help nowhere to be found and the "liberators" are coming. It's only you, untrained, unarmed, injured, against an entire Allied division, who doesn't think you are a neutral, and the last thing that enters your mind is "why?".
As you finish the game, you have that 1000 yard stare, your soul a burned chunk, the images of death, destruction and suffering forever burnt into your mind, and all you can do is mutter "why?". That's reality. You don't want that in a game. You want Nazi Zombies, you want Mammoth Tanks, you want Quad Damage and Railguns... not reality.