Because it just ain't a world war without zombies

Some may recall this lovely footage released from Call of Duty: World at War (WaW) about Halloween time:

Upon beating the main campaign, this 'Nazi zombie mode' is unlocked, featuring four player co-op whereby each wave of zombies are more difficult than the last. For those wondering what the heck Nazi zombies were doing in their World War II game, the game's publisher, Activision, has let loose on the what and why. Executive producer Daniel Suarez, commenting:



“It was one of the pet projects of one of the designers. The seed of the idea came out of casual [tower] defense games online. It was something that they [developer Treyarch] had been working on for a while and went back to when they had time.” “Nazi Zombies was sort of this rumor, and everybody would be like, ‘Nazi zombies? What Nazi zombies?’ The designers would sort of chuckle in the back corner and be like, ‘I don’t know what that is.’ And then one day it all of a sudden appeared in a build and it got so much traction internally.” “All of the QA guys, the marketing guys, even the PR guys became big fans. So we decided to save it and announce it [the week of Halloween on GameTrailers]. It was a project of love that a lot of guys had a hand in.”

Nothing against shooting Nazi zombies or anything, but it does make the game's sensitive footage and serious approach harder to accept on those grounds. I'd never be one to say it should be removed or anything like that, but what do you think?