As someone whose dance name, Morgiane, refers to a sword dance in the 1001 Nights, I have a few things to say.
First- women have gone to war as long as men have. It's not a particularly masculine thing.
Women Warriors Throughout History, 3500BC to 20th Century, battle, tournament, soldier, revolutionary, duellist, pirate, highwayman, general, gladiator, war, army, fighter, disguise, lady, female, maiden, military woman, female soldier, tar, navy, se
Second- much as what was discussed earlier in this thread, several styles of martial arts did develop as a dance (I believe kali is one of them; correct me if I'm wrong). Capoeira is another. The idea was to be able to practice fighting so the colonizers didn't know what people were doing.
Not all fighting is necessarily evil, weaponry is not either. The idea of 'I can take care of myself' is a nice one to have for everybody, men and women alike. Still, I think of the sword dance as mainly something beautiful, a 'hey look how I can balance this thing' dance.
Even if it is or was about war, if it is interesting, why not? It's not as if fighting never happens, and if bellydance expresses life, here we have another example of what happens in life. Much like the hula can be about war, or love, or childbirth, I think bellydance can encompass all those things too.