This really isn't a A&V Forum material.. should go to the O'Club.
But if I add my opinion..
Nazism itself isn't the same as anti-semitism, but the overall majority of the people of the Western civilization at that time were more or less anti-semitic. Once the hardlined opposition against Nazism failed to prevent Hitler's rise to power in 1933, and as the Nazional Sozialisten Partei took its grip over Germany, I think it can be said the less activistic majority of the populace, whether or not agreed on the other political issues the NAZI party offered, were to a degree associated in one way or another(ranging from vague hate feelings towards Jews to active support for the NAZI party) with the NAZI crimes against the 'Juden'.
Having experienced this otrocity, and finding out what the NAZIS really did to the Jews(and also, the guilt feelings of not being able to prevent the genocide as a citizen of the country), Germany(if i remeber correctly) has taken the principle of limiting certain freedoms of the populace if the consequence of those free actions are in support of a certain ideology that denounces the very existence of democratic rights of the people itself. Therefore, the freedom of speech and expression, if it supports NAZISM, is self-contradictory action that undermines the fundamentals of democracy - therefore outlawed - in Germany.
In the case of USA, (if I also remember this one correctly), any supportive/propagandistic expressions and statements towards NAZIsm itself cannot be outlawed since USA translates its constitution in a way that the first amendment supports the freedom of speech and expression - even to those in support of NAZIsm.
I remember seeing an comparative case of Germany(and the Europe) and the USA. NAZIsm is outlawed in Germany, and most of Europe, I believe, supports the same principles as Germany has. The concern and protest of the European people against the Ultra Rightwing Government that emerged recently in Austria was a good example of this.
Now, in the USA, I remember reading about an article in TIME magazine. Not being able to punish people for the reason of following NAZISM itself, the people opposing NAZI supporters in the USA have taken actions and filed a lawsuit against a certain local NAZI club for damages to private property and threatening the mental peace and order of the town.
Which is right, the European way? or the American way? I cannot say for sure since I'm an Asian(but I do tend to agree more to the European way, since my own country suffered under Japan, and most of the people today express concern towards the vocal and active nature and political influence of rightwing parties in Japan).
I guess when the chips fall, we can only respect what the German government has decided, and

what HTC has decided in this matter in their own little quest for world domination in the combat flight sim category

(hehehe). Seeing the Swastikas on LW planes would help a little immersion in my personal preference, but as long as there are people offended by it, and some people are denied the pleasure of this good game as long as the symbol exists.. I say we should not add the Swastikas to AH planes.