As an 'enthusiast' (a more appropriate word) of the war (10 years experience) who has studied the war seriously, built up his own library (special interest: ground combat), seen/participated in countless WW2 debates of forums and IRL so forth, the history of WW2 is very much controversial and still unraveling.
The attraction and baggage associated with this must come with the COH franchise since they loosely base the game off history. Why I think WW2 buffs like playing WW2 games? Because there is only so much the imagination can do from reading. Sometimes, we want something else-something with more stimulation oriented excitement to complement the hobby. The WW2 knowledge then, hopefully, 'enhances' the gaming experience but this requires the game to also 'work' with the knowledge.
Many people like me who play COH2 are not that interested in gaming unless it's about WW2. Personally, I've never been interested in a game unless it's about WW2. (men of war, red orchestra/Rising storm are the only other games I've played since the first COD/blitzkrieg)
The fanboyism and the political aggressiveness stems largely from the fact that this game bases on the armies of the two most adverse and powerful factions of the early-mid 20th century, a time that is still recent enough to affect people today.
If anything, I would probably advise the admins of the site to create an off topic WW2 forum as to seclude such conversations from contaminating balance forums and elsewhere.
Many history forums do the same thing with a politics sub-forum just to separate the contemporary politics from the more serious historical discussion. It's not always easy, as both, like COH and WW2, are intertwined.