We're talking about pop culture, not the culture in of itself. This revolves around fantasy and how the Britan likes to portray itself, not reality. You'll notice I haven't mentioned ONE source of role-playing games, but tons of differant things all around a similar theme, including one of the longer running comic universes out there.
The point here being is that with all of this stuff being produced, I don't see where there is any room to complain about Killzone, which is just another work of fantasy in a similar vein. The only possible reason to say "well this is differant" is simply because it seems to be being made by someone who isn't British. Sort of like a black person shooting off the "N" word every 15 seconds and then getting all upset when someone else does it.
I never said the British were goosestepping through the streets to planning campaigns of facist world domination in reality, simply that there is a definate trend to show that within british pop culture. You can protest it all you want and say that it's contrary to the British mentality as a whole, and that's fine, I believe you that people don't act that way in public or go around screaming that idealogy, but at the end of the day it's a popular escapist concept. I'm sure part of the whole appeal is specifically BECAUSE it's "wrong" sort of like kids wanting to be pirates, or going through a phase where they are interested in criminals and seriel killers. People don't go watch horror movies and cheer for the bad guys (hey it happens) due to some actual desire to go out and committ sadistic acts of murder. People go to see "A Nightmare On Elm Street" to see Freddy Kreuegar kill people in messed up ways, which is why he's iconic, and they sell action figures of him, not of the teen girls who ultimatly defeat him.
Yahtzee has no reason to pick on this aspect of things like it's in some way unfair, because it really isn't.
If you want to get technical as well, for all of the "OMG, we suffered so much" stuff from World War II, remember The British Empire was at one time the dominant world power, and engaged in a LOT of very aggressive wars of conquest before overextending itself. For all pretensions of "oh well we grew out of that" it's foolish to try and claim with a straight face that people don't look back at the time when their people were dominant, and the techniques and tactics they used to do it. Because of how relativelty recent he was people will point fingers at Hitler, but on a lot of levels he wasn't all that differant from other conquering powers. You can draw as many analogies between a lot of these really fascist and aggressive British fantasy concepts, and the time of The British Empire. Heck, Kipling probably would have found a lot to like in "Warhammer 40k".
Every nation wants to publically present itself as being peaceful, reactive, and nice guys, well unless they are the dominant world power usually. When fortunes change pretty much every former power goes "Ummm, yeah about all that fascism, racism, conquest and brutality... we're really sorry, we've outgrown that" and then whine about being on the receiving end.
The bottom line is that there is no reason to get defensive about it, or try and deny it, it's all right there so you can't anyway. My point isn't to be judgemental of any point except the hypocricy of the complaint... and again, nobody is saying that the British guy on the street right now is secretly some kind of militant maniac, not even fans of the materials being mentioned, no more than someone who likes horror movies is secretly planning to go on murder rampages.