May I also state that perpetuating ignorance by continuing to use the pentagram in such a manner doesn't actually indicate to any of us that you are aware of its origins or meaning?
As to the issue itself, I would hardly think that Richard the Lionhearted would consider his family crest to be an evil symbol, yet the Muslims of that era would certainly consider seeing that banner flying above one of their cities to be an evil thing. The symbol on the banners would be the crest of the army's leader. (See this image from Mulan) Try this Google search. If you don't like feudal Japan, try a different Asian nation.