barbzilla said:
3: Why they are used to represent a badass.... Okay I have nothing on this one, I tend to prefer a nice rapier.
Rapier? You mean that mincy little weapon mostly known as used by french "men" with silly looking twirled moustaches, long hair, wearing flamboyant clothes and wide-brimmed hats with two birds worth of fluffy feathers stuck to it?
I kid, I kid. The rapier is an elegant sword, but if you consider the stereotype I just presented, I think you'll understand that the common perception of the rapier and the people who used them doesn't exactly make people think "badass".
Anyhow, as to my own theory:
I think the katana might have this special status mainly because it is associated with a rather heavy warrior culture. After all, the japanese were quite good at glorifying martial skill (I mean if you compare current sports, you'll see that martial arts are still a really big thing even in japanese schools, while Europeans and Americans glorify things like Soccer, Ice-Hockey, American Football and Baseball). I.e fighting and warfare combined with a seriously bloody history probably makes the katana stand out in comparison to other swords.