To be fair, I own a bunch of swords, and I don't have any credible threats in my life. I just enjoy sharp pointy things, and if I'm going to carry a weapon, it's going to be a blade.
But I agree that swords have *one* use, and that is killing someone else. There is no practical use for them in non-militant pursuits. Knives, bows, axes - these all have other uses in peacetime. [Even guns] Not so the sword.
We see the Noldor using swords first in a sporting environment - holding martial arts competitions like the ones Tulkas did, but with blades now. We see Fëanor training his people in military exercises as Formenos. Prior to Fëanor's banishment, no one carried a sword openly.
By the time we get to the Kinslaying, the Noldor are well-armed and prepared for war (with Morgoth). The Teleri have fishing spears and knives and bows and arrows and no intention of killing anyone (though they are certainly willing to push them in the water, and a heavily armed Noldo could drown that way).