The main problem with the argument of the Sword being a weapon to kill men, is the fact that the Spear can serve the exact same purpose, in fact, it serves that purpose even better and was a very common weapon to find on a Battlefield, the Sword however, was in almost every situation, a BACKUP weapon, you would only fight with one if you had no other options, for example, if your Primary weapon was heavily damaged, the main benefit of using a Sword is it's versatility and speed.