Unfortunately, Nosara, it's a part of really really bad history. While it may feel stupid for some people, others may feel deeply offended by even the sight of the Swastika, and that's fully understandable.
The Germans for example, make it pretty clear that unless it is absolutely required (as in historical documentation or research), they will not tolerate a Nazi symbol being used. I guess their tolerance runs a little short for PC games - but then again, it is fully understandable and their legal position should be respected.
Thus, Swastikas are not allowed in the game, if the shape is used in association to the Third Reich. Buddhist symbols or the Finnish cross, is not, so it may be allowed.