A sword is nowhere near as dangerous as a gun, Evan a pistol. A pistol can kill from many feet away, a sword you need to be close. Just because something is dangerous doesn’t mean it should be banned, but when you get to a certain level of danger, such as guns, where you could kill 10 people in a second, then they need to be banned. Even pistols are way to dangerous. Also, swords are highly regulated in some states.

Then again, an assault rifle can fire roughly ten rounds a second, and you’d have great difficulty stabbing ten people every second with a sword, there is a difference in dangerousness